Best Helper Springs For Towing 2: Compare 10 Options

#1 · Best Overall

1. JTHKLAP TSS-106-40

Best for: Spring-under trailer stability.

Why it ranks #1: Designed for spring-under axle trailers rated 3,000–8,000 pounds; the set includes a line relocation bracket and is described as reducing bounce and sway.

A spring-under axle configuration and included line relocation bracket define this JTHKLAP trailer suspension kit. Its helper springs target trailers rated for 3,000–8,000-pound axles, with the stated aim of reducing bounce, fishtailing, and body roll for more controlled towing when empty or loaded.

Because this kit is specified for spring-under axle configurations, it targets a different trailer layout from spring-over systems. The line relocation bracket is included as part of the set, a practical detail for buyers planning the suspension change. JTHKLAP says the springs reduce bounce, fishtailing, and body roll whether the trailer is empty or fully loaded, addressing both unloaded travel and hauling. The listed 3,000–8,000-pound axle range gives shoppers a concrete application boundary to check.

Skip it if you need spring-over trailer springs; Flynsu’s TSS-107-47 is listed for spring-over axles.

Choose this for a spring-under trailer owner seeking support across empty and loaded towing, especially when sway and bounce are concerns. Keep its 3,000–8,000-pound axle range and required layout in view.

Listed on Amazon as: Replace TSS-106-40 Trailer for 3000-8000 lbs Trailer Axle, Spring-Under Axle Helper Springs with Line Relocation Bracket, Suspension Enhancement Kit Set of 2

#2 · Highest Stated Support

2. Flynsu TSS-107-47

• Weight: 5.99 lb
• Package Dimensions: 10.24 x 9.33 x 5.67 in

Best for: Spring-over heavy trailer support.

Why it ranks #2: Targets spring-over trailers with 5,000–8,000-pound GAWR and lists 1,800 pounds of capacity at 50% compression, with two springs and hardware.

A stated 1,800-pound capacity at 50% compression sets the Flynsu TSS-107-47 apart for spring-over trailer towing. Listed for 5,000–8,000-pound GAWR applications, this pair works without a compressor, offering load support without ongoing pressure adjustments or the air-system leak and crack risks cited in its features.

These springs fit spring-over axle trailers, with the listing identifying a 5,000–8,000-pound GAWR range; buyers can use those details to narrow the fit. Their 1,800-pound capacity at 50% compression gives a load-support reference, while compressor-free operation removes the need for pressure adjustments. The kit includes two frame-mounted rear auxiliary springs and mounting hardware, providing the pair and components for installation. Flynsu also describes reduced sway and body roll, useful aims for a more controlled towing ride.

Skip it if you have a spring-under axle trailer; JTHKLAP’s TSS-106-40 is specified for that arrangement.

This is for owners of spring-over trailers in the stated 5,000–8,000-pound GAWR class who want compressor-free auxiliary support. Verify the axle layout and consider the stated capacity at 50% compression when matching the kit.

Listed on Amazon as: TSS-107-47 Trailer Helper Springs-Over Axle, 5000-8000 lbs GAWR, 1800 lbs Capacity at 50% Compression (2Pack)

#3 · Complete Pair

3. BSNOVT TSS-107-40

Best for: TSS-107-40 replacement pair.

Why it ranks #3: Provides a left-and-right spring pair for trailer assemblies requiring TSS-107-40, with stated compatibility for 3,000–5,000-pound GAWR.

A two-spring TSS-107-40 replacement set for trailer leaf-spring assemblies is the BSNOVT kit’s clearest advantage. It is listed for 3,000–5,000-pound GAWR applications and supplies left and right springs together, supporting a matched axle installation for compatible trailer suspensions.

The TSS-107-40 designation and 3,000–5,000-pound GAWR range give buyers concrete details for matching this kit to a trailer leaf-spring assembly. Since the package includes both left and right springs, it provides the pair for an axle installation rather than requiring separate sides. BSNOVT also cites corrosion- and wear-resistant materials, which are intended to withstand road debris, heavy loads, and harsh weather. Those details make it a focused replacement option, not a universal trailer spring.

Skip it if you have a spring-under axle layout; JTHKLAP’s TSS-106-40 is listed for spring-under trailers.

This pair suits trailer owners replacing TSS-107-40 springs on compatible leaf-spring assemblies in the stated GAWR range. Match the model designation and axle application before treating it as a direct replacement.

Listed on Amazon as: Replace TSS-107-40 Trailer Auxiliary Helper Springs 2 Pack, Fits Leaf Spring Suspension Assemblies, Load Support & Leveling Kit

#4

4. ECOMARK TSS-107-40

• Weight: 5.5 lb
• Package Dimensions: 11 x 7 x 3 in

Best for: Spring-over trailer towing.

Why it ranks #4: Specifically fits spring-over trailer axles in the 3,000–5,000 range and is intended to help keep a loaded or towing vehicle level.

A spring-over-axle fit for 3,000–5,000-pound trailer configurations is the defining detail of this ECOMARK auxiliary spring. It adds support when the trailer carries cargo or a caravan, helping keep the vehicle level under load rather than leaving the rear suspension to handle towing weight alone.

The stated fit is specifically for trailers with springs mounted above the axle, so that configuration is the key compatibility check. Its load-bearing role is described for a fully loaded vehicle or a caravan trip, giving towing buyers a targeted suspension-support option. The listing identifies it as a TSS-107-40 replacement, which helps shoppers match the part to that application. The supplied information does not specify an installation procedure, so it is best approached as a configuration-specific replacement rather than a universal spring.

Skip it if you have a spring-under axle trailer; JTHKLAP’s TSS-106-40 is listed for that configuration.

This suits trailer owners seeking auxiliary support for a spring-over axle setup carrying cargo or a caravan. Its stated range is 3,000–5,000 pounds, so the axle arrangement and rating must match the application.

Listed on Amazon as: Suspension Helper Spring Replace ‎TSS-107-40 Trailer Auxiliary Spring

#5 · Pickup Load Assist

5. ATRACYPART Helper Spring Kit

• Weight: 22.7 lb
• Package Dimensions: 38 x 9 x 3 in

Best for: Classic truck leaf-spring assist.

Why it ranks #5: A truck-focused leaf-spring kit listing support up to 2,000 pounds and compatibility with several older Chevrolet, GMC, Ford, Dodge, and Toyota applications.

A 2,000-pound rear load-assist rating gives this ATRACYPART kit a clear role for compatible pickups and SUVs carrying weight or towing. It mounts directly on top of rear leaf springs, adding support at the suspension rather than requiring a full replacement of the vehicle’s existing spring setup.

The listed fitment spans named Chevrolet, GMC, Ford, Dodge, and Toyota models across specified years, making vehicle application the first practical check. Direct mounting on top of rear leaf springs places the support at the rear suspension, while the stated 2,000-pound assistance targets sag under heavier loads. The description also connects the kit with steadier handling and less rear-end bounce. Its broad model list is useful, but it does not make the kit universal beyond those listed applications.

Skip it if you drive a 2009–2018 Ram 1500 and want coil springs; Gleyi lists rear coils for that truck.

This kit suits owners of the listed older trucks or Toyota Tundra models who need rear leaf-spring load assistance for towing or hauling. Match the exact vehicle and year before choosing this application-specific kit.

Listed on Amazon as: Helper Spring Kit 2000 LBS Leaf Spring Load Assist for Pickup Trucks SUVs

#6

6. MSFORSPIRT 500LB Helper Kit

Best for: Bolt-on leaf-spring towing assist.

Why it ranks #6: Adds a stated 500 pounds of support for towing or hauling and describes bolt-on installation on existing leaf springs without welding.

A claimed bolt-on installation with no welding required is central to this 500-pound MSFORSPIRT helper spring kit. It mounts to existing leaf springs and is listed to help prevent loaded sag and reduce body roll, giving midsize truck owners a direct towing and hauling support option.

The kit lists 500 pounds of added support for towing trailers or carrying payloads, a defined figure for evaluating the loads it is meant to assist. Its direct leaf-spring mounting and no-welding installation claim offer a simpler installation route than a welded setup, and the listing says installation takes under 30 minutes. Included U-bolts, brackets, nuts, and washers provide the stated hardware. Compatibility is described as fitting most midsize trucks, with F-150, Silverado, and RAM named as examples.

Skip it if you need spring-over trailer springs rather than a truck leaf-spring kit; Flynsu lists a trailer-specific TSS-107-47.

This suits midsize truck owners seeking a bolt-on leaf-spring upgrade for towing or hauling, with hardware included. Its 500-pound support rating and stated truck compatibility are the practical limits to check.

Listed on Amazon as: 500LB Heavy Duty Helper Spring Kit for Pickup Trucks & SUVs – Towing Stabilizer to Prevent Sagging, Reduce Body Roll for Trailers, ATVs, Campers – Easy Install Upgrade for Leaf Springs

#7

7. Wyckoff Helper Spring Kit

• Weight: 12.62 lb
• Package Dimensions: 17.5 x 13.5 x 3.5 in

Best for: Corrosion-resistant 500-pound assist.

Why it ranks #7: A powder-coated steel option for pickup trucks, SUVs, and trailers, with a stated 500-pound additional load capacity for towing or cargo.

Powder-coated, corrosion-resistant steel is a practical differentiator in Wyckoff’s 500-pound helper spring kit. That construction is intended to withstand harsh on- and off-road conditions, while the added load capacity supports pickup trucks, SUVs, or trailers carrying extra weight or towing without replacing the full spring pack.

The stated 500-pound additional capacity gives buyers a defined support level for towing or hauling, while the powder-coated steel construction addresses exposure to harsh conditions. Wyckoff positions the kit as a way to reinforce rear suspension without a full spring-pack replacement, which can keep the upgrade focused on added assistance. Its installation guidance begins with cleaning and inspecting the suspension for rust or damage, then supporting the rear axle, making condition checks part of the setup workflow.

Skip it if you need a stated 2,000-pound assist; ATRACYPART’s leaf-spring kit lists that higher capacity.

Wyckoff fits buyers seeking modest rear-suspension reinforcement for towing or cargo, with corrosion-resistant construction for demanding conditions. Its stated 500-pound capacity is the boundary to weigh against heavier loads.

Listed on Amazon as: Wyckoff Helper Spring Kit,500LBS Heavy Duty for Pickup Truck, SUV,Trailer

#8

8. Venussar 500LB Helper Kit

• Weight: 12 lb

Best for: Stock leaf-spring 500-pound support.

Why it ranks #8: Designed to mount above rear leaf springs and work with the stock spring pack; its stated support is up to 500 pounds.

A 500-pound support rating paired with installation atop the existing rear leaf springs defines this Venussar helper kit. It works alongside the stock spring pack, giving truck owners who tow trailers or carry heavy loads added support without replacing the factory suspension assembly.

The kit is intended to complement the existing suspension and mount on top of rear leaf springs, so its role is supplemental rather than a complete spring replacement. Venussar rates it to help keep a truck level with up to 500 pounds of load, a defined limit for towing or hauling decisions. Alloy steel is the listed material. Buyers should focus on whether their vehicle uses the described rear leaf-spring arrangement and whether the stated load support suits their intended use.

Skip it if you need up to 2,000 pounds of stated support; ATRACYPART’s leaf-spring kit lists that capacity.

This suits truck owners who want supplemental support for trailer towing or cargo while retaining the stock spring pack. Its 500-pound rating and rear leaf-spring mounting are key boundaries for matching it to the load and vehicle.

Listed on Amazon as: Helper Spring Kit, 500 LBS Heavy Duty Helper Springs

#9 · Ram-Specific Option

9. Gleyi Ram 1500 Coil Springs

• Weight: 28.7 lb
• Package Dimensions: 19 x 13.5 x 7 in

Best for: Ram 1500 rear coil upgrade.

Why it ranks #9: Fits 2009–2018 Ram 1500 2WD and 4WD models and lists additional load support, but its specific vehicle fitment limits broader use.

Compatibility with 2009–2018 Ram 1500 2WD and 4WD trucks is the defining fit for Gleyi’s rear heavy-duty coil springs. The listing says they add load capacity for towing or bed cargo, helping counter the rear-end drop that can make a loaded truck harder to drive.

These are rear coil springs for the specified Ram 1500 model years and drivetrains, so they target a narrower vehicle group than universal-style leaf-spring kits. Gleyi lists an additional 70% load capacity and describes the springs as helping balance a load when towing or carrying heavy cargo. That makes the product relevant to owners addressing rear sag, but the supplied listing also states an additional 1,100 pounds in its feature text; buyers should note that this figure is presented alongside the percentage.

Skip it if you need a helper spring kit for a different truck; Venussar’s kit mounts on rear leaf springs.

This is for owners of the listed Ram 1500 years and drivetrains seeking rear coil support for towing or bed loads. Its narrow vehicle fit is essential, so it is not a general-purpose trailer spring.

Listed on Amazon as: Rear Heavy Duty Coil Springs Compatible with 2009-2018 Ram 1500 2WD 4WD, Provide Extra 70% Load Capacity (2700 pounds per coil)

#10

10. Hellwig 991 EZ-990

• Weight: 19 lb

Best for: Dodge Ford GM Toyota owners.

Why it ranks #10: The listing describes an EZ-990 helper spring kit for Dodge, Ford, GM, and Toyota, but provides no capacity or detailed axle fitment here.

The EZ-990 name and stated Dodge, Ford, GM, and Toyota application make this Hellwig helper spring kit a vehicle-focused choice. Its steel construction and established manufacturer identity may appeal to truck owners seeking a suspension helper, but the supplied product details do not state a load-capacity figure.

Hellwig identifies this as an EZ-990 Helper Spring Kit for Dodge, Ford, GM, and Toyota, giving shoppers a starting point for checking vehicle application. The product weighs 19 pounds and measures 43 by 3 by 8 inches, details relevant to handling and planning storage before installation. Hellwig’s supplied information says its steel products are manufactured in California. The listing does not provide a specific fitment chart or installation steps here, so buyers should rely on the exact vehicle application information available for this kit.

Skip it if you want a stated 500-pound capacity and leaf-spring installation; Venussar lists both for its helper kit.

This may suit Dodge, Ford, GM, or Toyota owners considering a Hellwig helper spring kit. The supplied details leave load capacity and exact vehicle fitment unspecified, so those application boundaries matter before purchase.

Listed on Amazon as: Hellwig 991 EZ-990 Helper Spring Kit