A strong air bag suspension choice for a trailer should match its existing suspension or provide clearly stated dimensions and capacity, making fitment the first decision for owners replacing worn springs or adapting a setup. The six options here include direct-replacement bags for Hendrickson-related applications, universal bellows, and kits made for specific trucks. They are not interchangeable: a truck kit that helps level a tow vehicle is different from a replacement air spring fitted to a trailer axle.
The STILEALUS four-pack leads for buyers whose existing part number matches its extensive compatibility list. For a more general setup, compare the universal bags’ design dimensions, port size, and stated load capacity, and verify mounting details before ordering.
The guide ranks each product by trailer relevance and the fitment information supplied.
For a trailer air spring replacement, STILEALUS Trailer Air Spring 4-Pack leads when your existing part number matches its listed Hendrickson, AAT, or interchange applications. Its four-bag set supports balanced replacement across the vehicle and lists numerous compatible part numbers. If that match is not confirmed, consider the lanstixr Trailer Air Spring for its stated Firestone and Hendrickson replacements, or the eLifecenter Triple Bellow for a universal option with stated dimensions and 2,600-pound capacity.
Verify the old part number and mounting measurements before choosing.
Our Top Picks
Best OverallSTILEALUS Trailer Air Spring 4-Pack
Its four-bag set targets trailer applications and lists numerous Hendrickson, AAT, and interchange numbers, making verified part-number fitment its strongest advantage.
View on Amazon
Best OE ReplacementIt explicitly replaces Firestone 9978 and Hendrickson C-28929/S-28929 numbers, with steel and natural-rubber construction for a targeted replacement.
View on Amazon
Best Universal FitIts listing names trailers and gives a 2,600-pound capacity, 257 mm design height, 1/2-inch NPT port, and mounting-hole details.
View on Amazon- Best Double Bellow maXpeedingrods Double Bellow
- Highest Capacity RETRUE Universal Air Bags
Compare trailer air spring replacement options
| # | Product | Weight | Dimensions | Buy |
|---|---|---|---|---|
| 1 | 1. STILEALUS Trailer Air Spring 4-PackBest Overall | — | — | View on Amazon |
| 2 | 2. lanstixr Trailer Air SpringBest OE Replacement | 14.97 lb | 11 x 11 x 15 in | View on Amazon |
| 3 | 3. eLifecenter Triple BellowBest Universal Fit | 12.29 lb | 6.97 x 6.97 x 10.12 in | View on Amazon |
| 4 |  4. maXpeedingrods Double BellowBest Double Bellow | 8.71 lb | 12.01 x 7.48 x 7.28 in | View on Amazon |
| 5 |  5. RETRUE Universal Air BagsHighest Capacity | — | — | View on Amazon |
| 6 |  6. Rough Country Silverado KitSilverado and Sierra towing | 23.6 lb | — | View on Amazon |
Detailed Reviews: Best Air Bag Suspension For Trailers
#1 · Best Overall
1. STILEALUS Trailer Air Spring 4-Pack
Best for: Four-bag truck replacements.
Why it ranks #1: Its four-bag set targets trailer applications and lists numerous Hendrickson, AAT, and interchange numbers, making verified part-number fitment its strongest advantage.
A four-piece set is the defining advantage of the STILEALUS air springs: it supplies four bags for a complete vehicle replacement, supporting balanced ride performance across all wheels. Its extensive interchange list covers named Hendrickson, Intraax, and Van Traax applications, making OE-number matching central to choosing this set.
The four-bag package can support a coordinated replacement rather than mixing old and new springs, while the listed interchange numbers give owners a practical way to identify the intended application. Compatibility includes S-20900, S-21800, C-20900, C-21800, W01-358-8709, and 1R13-159, among other numbers. The supplied guidance recommends checking the existing spring’s OE or interchange number, which makes identification part of the purchasing workflow rather than relying on a broad vehicle description.
- Four air spring bags are included for a full set.
- Compatibility list includes multiple Hendrickson numbers.
- Lists fitment for AAT 23K Intraax and Van Traax models.
- OE and interchange number matching guidance is supplied.
- Fitment depends on matching a listed OE or interchange number; it is not a universal spring.
Skip it if you need a universal single pair for varied truck applications; maXpeedingrods NA32 is listed for many truck makes and models.
This set suits truck owners replacing four springs on an application that matches its interchange list. Use the existing bag’s OE number to check compatibility; its four-piece format is less suited to a single-bag repair.
Full product details
| Brand | STILEALUS |
|---|---|
| Compatible with Vehicle Type | Truck |
| Included Components | 4 pack of AIR SPRING BAG with Other Accessories |
| Manufacturer | EST Auto Part |
| Part Number | W01-358-8709 |
| Manufacturer Warranty Description | 1 YEAR WARRANTY |
| Model Number | JHABC20003-new |
Listed on Amazon as: 4 Pack of Air Spring Bag for Trucks Fits for Hendrickson Trailer S-20900, S-21800, C-21800, Fits for AAT 23K Models Intraax & Van Traax, and Fits for W01-358-8709, 1R13-159
View on Amazon#2 · Best OE Replacement
2. lanstixr Trailer Air Spring
- Weight: 14.97 lb
- Dimensions: 11 x 11 x 15 in
Best for: Hendrickson interchange replacements.
Why it ranks #2: It explicitly replaces Firestone 9978 and Hendrickson C-28929/S-28929 numbers, with steel and natural-rubber construction for a targeted replacement.
A broad replacement-number list makes the lanstixr air spring useful for matching specific trailer suspension applications: it names Firestone 9978 and W01-358-9978, plus Hendrickson C-28929 and S-28929. Its steel-and-natural-rubber construction is described as supporting sealing and reducing air leakage.
The listed Firestone, Hendrickson, and Vigor numbers give owners a direct interchange reference when identifying a replacement, helping focus selection on the existing spring rather than a generic trailer description. SPHC steel and natural rubber are the stated materials; the product description connects them with sealing and reduced air leakage. The listing also describes handling intended to provide a smooth, controlled ride and prevent sagging, but the specified interchange numbers remain the key application boundary.
- Lists Firestone 9978 and W01-358-9978 replacements.
- Names Hendrickson C-28929 and S-28929 interchange numbers.
- Made with SPHC steel and natural rubber.
- Description targets controlled handling and reduced sagging.
- Application is tied to the listed Firestone, Hendrickson, and Vigor replacement numbers.
Skip it if you need a four-bag replacement set for listed truck applications; STILEALUS JHABC20003-new includes four air springs.
Consider this spring when replacing a trailer air bag that matches one of its listed Firestone, Hendrickson, or Vigor numbers. Its material and ride claims suit replacement use, but the interchange list defines its application.
Full product details
| Brand | lanstixr |
|---|---|
| Item Weight | 14.97 pounds |
| Item model number | AS HE 8929 |
| Manufacturer | Lanstixr |
| Part Number | AS HE 8929 |
| Model | AS HE 8929 |
| Dimensions | 11 x 11 x 15 inches |
Listed on Amazon as: Trailer Air Spring Bag-Replaces Firestone 9978,W01-358-9978,Hendrickson C-28929 S-28929,Vigor S28929 S29928,Air Suspension Kit
View on Amazon#3 · Best Universal Fit
3. eLifecenter Triple Bellow
- Weight: 12.29 lb
- Dimensions: 6.97 x 6.97 x 10.12 in
Best for: Heavy-load universal trailer setups.
Why it ranks #3: Its listing names trailers and gives a 2,600-pound capacity, 257 mm design height, 1/2-inch NPT port, and mounting-hole details.
A triple-bellow structure gives this eLifecenter air spring increased suspension travel, helping deliver a smoother, more controlled ride when carrying heavy loads. Its stated 2,600-pound load capacity and universal application make it a candidate for many trucks, trailers, buses, and vans, provided the mounting dimensions work for the vehicle.
The 10.12-inch design height, 131 mm top plate, and 3/8-16UNC mounting holes give buyers concrete dimensions to compare with their suspension layout before installation. A 1/2-14NPT single port sets the air connection size, while the triple-bellow construction supports increased travel and flexibility. The body is about 7 inches wide and expands to approximately 7.5 inches when inflated at 100 PSI, so available clearance matters as the bag operates.
- Triple-bellow construction increases suspension travel.
- Rated for 2,600 pounds of load capacity.
- 1/2-14NPT single air port.
- Universal application lists trucks, trailers, buses, and vans.
- Its 10.12-inch design height and roughly 7-inch body require adequate mounting clearance.
Skip it if you need a four-spring matched replacement set; STILEALUS JHABC20003-new includes four bags for listed truck applications.
Choose this eLifecenter spring for a universal-style truck or trailer setup where its triple-bellow travel and 2,600-pound capacity suit the load. Check mounting dimensions and clearance; the listing specifies a single port and one spring design.
Full product details
| Brand | eLifecenter |
|---|---|
| Item Weight | 12.29 pounds |
| Item model number | AS_GMC_3E2600X2 |
| Manufacturer | Zhejiang Gold Intelligent Suspension Group |
| Part Number | AS_GMC_3E2600X2 |
| Dimensions | 6.97 x 6.97 x 10.12 inches |
Listed on Amazon as: Universal 2600 lbs Triple Bellow Air Suspension Bags 1/2" NPT Single Port
View on Amazon#4 · Best Double Bellow
4. maXpeedingrods Double Bellow
- Weight: 8.71 lb
- Dimensions: 12.01 x 7.48 x 7.28 in
Best for: Universal truck helper bags.
Why it ranks #4: This universal double-bellow pair is rated at 2,500 pounds per spring, but its listed applications emphasize trucks rather than trailer-specific replacements.
Each maXpeedingrods double-bellow spring is rated for up to 2,500 pounds, giving truck owners a way to support changing loads and absorb road shock. The pair is listed for many truck makes, including Ford, GMC, Chevrolet, and Dodge, so it suits broad applications where the single-port connection matches.
The two-bag set offers a matched pair for a truck application, while the double-bellow construction and stated capacity address varying load conditions and road shock. Steel-braided cord-reinforced ribs and multi-layer nylon belt cords bonded into rubber describe the spring construction. Its 1/2-inch NPT air connection is a key setup detail; the supplied fitting information specifies a 6 mm tube outside diameter and recommends air-application thread sealant or tape to help avoid leaks.
- Pair of universal air suspension springs.
- Each spring has up to 2,500 pounds of capacity.
- Double-bellow design addresses varying loads and road shock.
- Reinforced construction uses steel-braided ribs and nylon belt cords.
- The 2,500-pound rating applies to each spring, not the pair as one stated capacity.
Skip it if you need triple-bellow travel and a 2,600-pound rating; eLifecenter AS_GMC_3E2600X2 lists that configuration.
Consider this pair for a truck needing load-responsive helper springs, especially where its listed universal applications and 1/2-inch NPT port suit the setup. Keep the per-spring rating distinct, and plan the specified 6 mm tube connection.
Full product details
| Brand | maXpeedingrods |
|---|---|
| Item Weight | 8.71 pounds |
| Item model number | NA32 |
| Manufacturer | maXpeedingrods |
| Part Number | NA32 |
| Dimensions | 12.01 x 7.48 x 7.28 inches |
Listed on Amazon as: maXpeedingrods 2PCS Universal Air Suspension Spring Double Bellow Standard 2500 lbs 1/2"npt Single Port Replacement Air Helper Bags for Trucks
View on Amazon#5 · Highest Capacity
5. RETRUE Universal Air Bags
Best for: Adjustable load-leveling setups.
Why it ranks #5: Its stated 6,000-pound load-leveling capacity and 5–100 PSI range offer substantial adjustment, though the listing does not establish trailer fitment.
An adjustable 5–100 PSI operating range lets the RETRUE air bags be tuned to different loading needs, while the listed 6,000-pound load-leveling capacity targets everyday carrying demands. Its three-chamber upgrade over a traditional two-chamber design gives buyers a distinct construction choice for an adjustable suspension setup.
Pressure adjustment from 5 to 100 PSI lets owners tune the bags to the load, connecting the operating range to day-to-day leveling needs. The 6,000-pound capacity applies to the load-leveling setup, and the listing cautions that truck-bed weight plus cargo must stay within that limit. The three-chamber construction distinguishes this kit from a traditional two-chamber design. Included air fittings support the air connection, but the supplied information does not specify vehicle fitment dimensions.
- 6,000-pound load-leveling capacity.
- Adjustable air pressure from 5 to 100 PSI.
- Three-chamber design upgrades a traditional two-chamber layout.
- Air fittings are included.
- The stated 6,000-pound limit includes the truck bed and cargo.
Skip it if you need a kit listed for a specific Silverado or Sierra 1500; Rough Country 10011 names those truck applications.
Choose RETRUE for an adjustable load-leveling setup when the 5–100 PSI range suits your operating needs. Keep the combined truck-bed and cargo weight within 6,000 pounds, and resolve vehicle fitment before planning installation.
Full product details
| Brand | RETRUE |
|---|---|
| Included Components | Air Bags, Air Fittings, |
| Manufacturer | RETRUE |
| Part Number | RAK-3UAB |
| Manufacturer Warranty Description | 1 Year |
| Model Number | RAK-3UAB |
Listed on Amazon as: RETRUE Universal Air Bags Air Suspension Kit 6000 Lbs Capacity
View on Amazon#6
6. Rough Country Silverado Kit
- Weight: 23.6 lb
Best for: Silverado and Sierra towing.
Why it ranks #6: This kit is specifically for 2019–2026 Silverado and Sierra 1500 trucks with stock lift, so it serves the tow vehicle rather than trailer suspension.
Vehicle-specific fitment is the Rough Country kit’s central advantage: it is listed for Chevy Silverado and GMC Sierra 1500 models from 2019–2026 with stock lift. Its rear air bags aim to maintain a level stance while towing, helping address trailer sway and rear-end bottoming under heavy loads.
Double-convoluted air bags work with powder-coated steel brackets and DOT-approved airlines to form a rear suspension kit for the listed trucks. The package includes mounting brackets, U-bolt plates, block shims, inflation valves, and 90-degree fittings, giving buyers a defined installation component set. For towing or hauling, the leveling focus addresses rear sag, while the kit’s model-year and stock-lift restriction narrows its application to specified Silverado and Sierra 1500 configurations.
- Listed for Chevy Silverado and GMC Sierra 1500, 2019–2026, with stock lift.
- Double-convoluted air bags target rear load support.
- Powder-coated steel brackets are included.
- DOT-approved airlines are included.
- Fitment is limited to the listed Silverado and Sierra 1500 models with stock lift.
Skip it if you need a universal replacement for a trailer axle; lanstixr AS HE 8929 lists trailer air-spring interchange numbers.
This kit fits owners towing with a listed stock-lift Silverado or Sierra 1500 who want rear load leveling and included mounting hardware. Its vehicle and lift restrictions make it a poor match for other truck configurations.
Full product details
| Brand | Rough Country |
|---|---|
| Included Components | (2) Air Bags, Block Shims & Hardware, Inflation Valves, 90° Fittings, Mounting Brackets, U-Bolt Plates & Fittings See more |
| Item Weight | 23.6 pounds |
| Manufacturer | Rough Country |
| Part Number | 10011 |
| Manufacturer Warranty Description | Limited Lifetime Warranty |
| Material | Alloy Steel, Nylon, Rubber |
| Model Number | 10011 |
| Additional Information | Important Information Proposition 65 Warning for California Consumers WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov |
Listed on Amazon as: Rough Country Air Bags Suspension Kit for Chevy Silverado & GMC Sierra 1500 (2019-2026) with Stock Lift – Minimizes Trailer Sway, Prevents Bottoming Out
View on AmazonTrailer spring replacement: the part-number trap
A trailer air spring can look close to another model and still fail to match its mounting or air connection, so verify the part number before relying on a general fit claim. The STILEALUS listing provides a broad set of Hendrickson and interchange numbers, including S-20900, W01-358-8709, and 1R13-159; compare the number on the old spring directly with that list. The lanstixr listing instead names Firestone 9978, W01-358-9978, and Hendrickson C-28929/S-28929.
Those are separate replacement families, not evidence that the products interchange. Universal options have a different trap: eLifecenter gives a 257 mm design height, 131 mm top-plate diameter, three bottom mounting holes, and a 1/2-14 NPT port, but the buyer still needs to compare the actual mounting layout.
Confirm the old part number and physical dimensions before ordering; contact a dealer if the identification remains uncertain.
Trailer air springs versus tow-vehicle helper bags
A helper-bag kit for a towing truck does not automatically replace a trailer’s suspension spring. The Rough Country product is explicitly a rear kit for Silverado and Sierra 1500 trucks, while RETRUE describes load leveling but does not give a trailer-specific fitment list in the supplied details. Those listings may interest someone addressing tow-vehicle sag, but they do not establish compatibility with a trailer axle.
By contrast, STILEALUS and lanstixr identify trailer or truck-and-trailer replacement applications and supply replacement part numbers. Universal eLifecenter and maXpeedingrods bags offer another route, but universal wording does not guarantee they fit a particular trailer mounting arrangement.
Keep the two jobs distinct: leveling the tow vehicle and replacing a trailer air spring. Match the product to the vehicle or trailer where it will be installed, then confirm load requirements, dimensions, and fittings.
How to Choose Trailer Air Bag Suspension
Fitment and replacement numbers
Look first for a confirmed match to your existing spring or mounting arrangement. STILEALUS lists S-20900, S-21800, C-20900, C-21800, W01-358-8709, W01-358-8751, and several other interchange numbers; lanstixr lists Firestone 9978 and Hendrickson C-28929/S-eLifecenter is described as universal for most trucks, trailers, buses, and vans, but also asks buyers to check detailed bag size.
The maXpeedingrods listing emphasizes truck applications, and the two load-leveling kits are not identified as trailer replacements. Buyers replacing a known part should favor a listed number; buyers adapting a setup should favor a universal bag only after verifying measurements and mounting.
Capacity and intended load
Compare capacity figures carefully, and do not treat different products’ ratings as directly interchangeable. eLifecenter lists 2,600 pounds, while maXpeedingrods states up to 2,500 pounds per spring. RETRUE specifies 6,000 pounds of load-leveling capacity and warns that total weight, including the truck bed and cargo, must not exceed its limit.
The supplied STILEALUS and lanstixr details do not give a numerical capacity, and Rough Country’s supplied details do not state one. Buyers choosing universal bellows can use the stated capacity as a starting point, but must check how the rating applies to the intended installation.
For a trailer replacement, fitment and the maker’s correct load application take precedence over selecting the largest number.
Construction, configuration, and connections
Check the spring style, included set, and air connection against the installation you need. eLifecenter is a triple-bellow bag with a 1/2-14 NPT port, 257 mm design height, and three bottom mounting holes; maXpeedingrods is a double-bellow pair with a single 1/2-inch NPT port. STILEALUS includes four air spring bags, while Rough Country lists two bags, brackets, inflation valves, fittings, and hardware for its truck-specific kit.
RETRUE includes air bags and fittings, and lanstixr describes steel and natural-rubber construction. Buyers replacing all four listed trailer springs may prefer the STILEALUS set if fitment matches.
Buyers selecting a universal bag should check port thread, height, mounting holes, and whether required fittings are included.
Which Trailer Air Bag Suspension Should You Choose?
Choose STILEALUS Trailer Air Spring 4-Pack if your trailer’s existing spring number appears in its compatibility list; its four-bag set is the clearest match for a complete replacement. Choose lanstixr Trailer Air Spring if your old unit matches Firestone 9978 or the listed Hendrickson numbers. For an adaptable setup, consider eLifecenter Triple Bellow after confirming its 257 mm height, 131 mm top plate, mounting holes, and 1/2-14 NPT port suit your trailer.
maXpeedingrods Double Bellow is another universal option, but its listing focuses on truck applications. RETRUE Universal Air Bags and Rough Country Silverado Kit are better considered for load leveling on a vehicle, not as confirmed trailer spring replacements.
When fitment is uncertain, identify the old spring number and consult a dealer before ordering.
Related Buying Guides
- Best Air Bags For Motorcycles
- Best Air Bag Jack For Trucks
- Best Air Bags For Lowered Trucks
- Best Air Suspension Seat For Tractors
- Best Air Bags For Towing With Compressor
- Best Air Suspension For Towing 2
Frequently Asked Questions
How do I identify the correct replacement air spring part number for my trailer?
Read the number on the existing air spring and compare it with the replacement’s listed part numbers and applications. Also check the mounting measurements and air-port configuration against your current setup. If the number is missing or fitment remains uncertain, consult a trailer dealer before ordering.
What air pressure should I use in trailer air bags while towing?
Use the pressure specified by the air-bag and suspension manufacturers for your setup; there is no single pressure supported here for every trailer. Check the product instructions and your trailer requirements, and do not exceed any stated limits. If guidance is unclear, ask a qualified dealer before towing.
Do trailer air bags require a compressor or separate inflation valves?
The listed products specify air ports, but the supplied information does not establish whether a compressor or separate valves are included. Check the exact product contents and installation instructions. Before buying, confirm how the bags are inflated and whether your trailer’s existing air system provides the required connections.
What should I verify before choosing a universal air spring?
Confirm that the spring’s dimensions, mounting holes, and port match your trailer, rather than relying on the word “universal.” For the eLifecenter triple bellow, the stated checks include 257 mm height, a 131 mm top plate, mounting holes, and a 1/2-14 NPT port.
Can a vehicle air-bag kit replace a trailer air spring?
Not necessarily. A vehicle load-leveling kit is not a confirmed trailer spring replacement unless its fitment matches your trailer. The Silverado kit is listed for a vehicle, and the RETRUE listing describes universal air bags.
Verify the old spring number and mounting details before considering either for a trailer.
Final Words
Start by matching the number on your existing spring to the replacement’s compatibility list. When it matches, the STILEALUS four-bag set is the clearest complete-replacement choice; consider lanstixr for its listed Firestone or Hendrickson replacements. If neither is confirmed, assess the eLifecenter triple bellow against your mounting measurements and port.
Treat truck- or vehicle-focused kits cautiously, and consult a dealer if fitment remains uncertain.
