Best Tool Box For Flatbed Trailer: Compare 10 Options

#1 · Best Overall

1. Buyers Products 1705210

• Dimensions: 48"L x 18"W x 18"H
• Material: Aluminum
• Weight: 56 lb

Best for: Wide-access flatbed storage.

Why it ranks #1: Made for flatbeds and trailers, this 48 x 18 x 18-inch aluminum underbody box has barn doors, a rain gutter, bulb seal, and three-point locking.

Barn doors give this 48-inch Buyers Products underbody box a wide-opening alternative for reaching tools on a flatbed trailer. Its .100-inch diamond-tread aluminum construction resists corrosion, while a rain gutter, bulb seal, and compression latch help protect stored gear from weather and travel movement.

The 48-by-18-by-18-inch enclosure provides a long storage area, and side-hinged barn doors offer access across the front rather than a single drop-door opening. A continuous aluminum hinge with a quarter-inch pin supports the doors, while a three-point locking system and compression latch secure them. The rain gutter and bulb seal help keep contents dry and dust-free, making this setup useful for exposed trailer work where weather protection and access matter.

Skip it if you have limited underbody clearance or mounting space; its 48-by-18-by-18-inch body needs room.

This Buyers Products box suits flatbed and work-truck operators who want weather-resistant storage with broad barn-door access. Its 48-inch length and 18-inch height make measuring available underbody space essential before selecting it.

Listed on Amazon as: Buyers Products 1705210 Underbody Truck Tool Box with Barn Doors, 18x18x48 Inch, Diamond Tread Aluminum, Made in USA, Compression Latch, Weather Resistant, Toolbox for Flatbeds, Trailers & Work Trucks

#2 · Steel Construction

2. Buyers Products 1702305

• Dimensions: 36"L x 18"W x 18"H
• Material: Alloy Steel
• Weight: 76 lb

Best for: Heavy-duty underbody storage.

Why it ranks #2: Its 36 x 18 x 18-inch underbody format suits work trucks, flatbeds, and trailers, with 14-gauge steel and a compression latch.

Fourteen-gauge steel construction gives this Buyers Products box a substantial enclosure for tools and supplies carried on a flatbed trailer. Its 36-by-18-by-18-inch footprint provides a dedicated underbody storage space, while a locking compression latch helps keep the recessed drop door closed during travel.

The stainless steel T-handle compression latch pulls the recessed drop door against its gasket, helping secure contents and reduce rattling on the road. A continuous hinge supports the door, and the 36-by-18-by-18-inch dimensions offer room for tools, parts, and supplies without using the trailer deck. At 76 pounds, this steel box has a notable handling consideration during installation; its lockable construction suits buyers prioritizing a sturdy, secured underbody enclosure.

Skip it if you need a lighter enclosure to lift into place; this steel box weighs 76 pounds.

Flatbed and work-truck owners who want a substantial, lockable underbody box for tools and parts should consider it. Account for its 76-pound weight when planning installation and make sure the 36-by-18-inch footprint suits the available mounting space.

Listed on Amazon as: Buyers Products 1702305 36 x 18 x 18 Inch Steel Underbody Tool Box

#3 · Black Aluminum

3. FORWODE 36×17 Underbody Box

• Dimensions: 36"L x 17"W x 17.91"H
• Material: Aluminum

Best for: Underbody cargo-space saver.

Why it ranks #3: The 36 x 17 x 17.91-inch aluminum underbody box is designed for trailers and frees cargo space, with a stated 75-pound maximum recommendation.

Mounting this 36-inch FORWODE box underneath a truck or trailer frees cargo-area space for other loads. Its aluminum construction offers a dedicated home for tools or camping gear, and the lockable foldable T-handle provides access to the enclosed storage while keeping it secured.

The 36-by-17-by-17.91-inch dimensions give the box a broad underbody storage area for tools and gear, while the under-mounting approach keeps that equipment out of the main cargo area. Aluminum construction helps keep the enclosure lighter than a steel option, and its listed maximum weight recommendation is 75 pounds. A lock and foldable T-handle support secured access; measure the space below the vehicle and consider the load limit before installation.

Skip it if you need to carry loads above 75 pounds; this box's listed maximum weight recommendation is 75 pounds.

Choose this FORWODE if you want underbody storage for a pickup, trailer, RV, or garage and value keeping cargo space clear. Its 75-pound load recommendation and 36-inch length should guide capacity and placement decisions.

Listed on Amazon as: FORWODE 36x17x18 Inch Underbody Truck Tool Box Aluminum Trailer Tool Box with Lock & Foldable T-Handle Waterproof Truck Storage Box for Pickup Truck, Trailer, RV, ATV, Indoor(BLACK)

#4 · Sealed Aluminum

4. VEVOR 36×14 Underbody Box

• Dimensions: 36"L x 14"W x 16"H
• Material: Aluminum
• Weight: 24.7 lb

Best for: Versatile aluminum underbody storage.

Why it ranks #4: This 36 x 14 x 16-inch aluminum underbody box lists a rubber sealing strip, lock and keys, and a 110-pound maximum weight recommendation.

A rubber sealing strip helps this VEVOR aluminum underbody box keep water out when closed, making it useful for tools and gear carried on a trailer. Its 36-by-14-by-16-inch format can also be installed beneath a truck, on a camper, or on a pickup rack.

The rubber strip seals the closed lid against water, while the aluminum construction is listed as rust- and corrosion-resistant, supporting outdoor storage for maintenance tools or camping gear. Its 36-by-14-by-16-inch dimensions provide a substantial enclosure, and the product supports installation under trucks and trailers as well as on a camper or pickup rack. A lock and two keys secure the contents; the stated maximum weight recommendation is 110 pounds, a useful limit for loading decisions.

Skip it if you need to carry more than 110 pounds in the box; its listed maximum weight recommendation is 110 pounds.

This VEVOR fits buyers wanting a lockable aluminum enclosure that can serve under a trailer or in other listed vehicle locations. Its 110-pound maximum recommendation and 36-inch length are key boundaries for load and space planning.

Listed on Amazon as: VEVOR Underbody Truck Box, 36"×14"×16" Pickup Storage Box, Heavy Duty Aluminum Diamond Plate Tool Box with Lock and Keys, Waterproof Trailer Storage Box with T-Handle Latch for Truck, Van, Trailer

#5 · Lightweight Option

5. Parts-Diyer Underbody Box

• Dimensions: 24"L x 17"W x 18"H
• Material: Aluminum
• Weight: 18 lb

Best for: Lightweight multi-vehicle storage.

Why it ranks #5: At 24 x 17 x 18 inches and 18 pounds, this aluminum underbody box is designed for flatbeds and trailers while saving cargo space.

At a listed 18 pounds, this 24-by-17-by-18-inch Parts-Diyer aluminum box offers underbody storage without a heavy enclosure. Its rust- and corrosion-resistant material suits flatbeds, trailers, RVs, ATVs, and dump trucks, while mounting underneath leaves the truck bed available for cargo.

The 24-inch length makes this a more compact choice for buyers with limited mounting space, and its aluminum body is listed as rust- and corrosion-resistant. Underbody installation preserves bed space, while the product is specified for several vehicle types, including trailers, RVs, and ATVs. The lightweight construction can make removal and remounting easier, and keys are included. Its smaller dimensions suit essential gear better than buyers needing a long storage chest.

Skip it if you need a long enclosure for bulky tools; the 24-inch length gives you a compact storage footprint.

Consider this Parts-Diyer for owners needing lightweight underbody storage across a trailer, RV, ATV, or truck. Its 24-inch length is a useful space-saving boundary, but may not suit long tools or bulky loads.

Listed on Amazon as: 24 x 17 x 18 inch Underbody Aluminum Toolbox for Truck Boat RVs Trailer

#6

6. ARKSEN 49-Inch Tongue Box

• Dimensions: 49"L x 13"W x 18.5"H
• Material: Alloy Steel
• Weight: 53.6 lb

Best for: Long tongue-gear storage.

Why it ranks #6: The 49 x 13 x 18.5-inch steel chest offers ample stated dimensions and a weather-tight design, but its tongue mounting is less direct for many flatbeds.

A 49-inch length gives the ARKSEN steel trailer tongue box room for drills, wrenches, tie-down straps, and other towing essentials. Its 13-by-18.5-inch profile organizes gear in a dedicated chest, while a black powder-coated finish is specified to resist scratches, moisture, and corrosion outdoors.

The stated 49-by-13-by-18.5-inch dimensions offer a long storage area for chains, straps, cables, equipment, and tools, helping keep towing gear together. Heavy-duty steel provides the enclosure, and the black powder-coated finish is intended to resist moisture, scratches, and corrosion in road conditions. Its 53.6-pound listed weight is relevant when positioning the box on a trailer tongue, so consider handling and available mounting space before choosing this longer format.

Skip it if you need a compact tongue box; its 49-inch length may take more trailer space than a shorter model.

Choose this ARKSEN for a trailer setup needing a long, steel storage chest for straps, chains, and tools. Its 49-inch length and 53.6-pound weight make available tongue space and installation handling important considerations.

Listed on Amazon as: ARKSEN 49" Steel Trailer Tongue Tool Box, Heavy Duty Storage Chest, Black

#7

7. EASYBERG 30-Inch Tongue Box

• Dimensions: 30"L x 13"W x 13"H
• Material: Aluminum

Best for: Compact aluminum tongue storage.

Why it ranks #7: Its 30 x 13 x 13-inch aluminum construction, lock, keys, and gas-strut lid suit tongue storage, though it is less versatile for underbody mounting.

A 30-inch aluminum body makes this EASYBERG trailer tongue box a compact way to organize tools, straps, and accessories. Its 5-bar tread pattern and fully welded 1.5-millimeter construction support outdoor use, while the lockable lid with gas strut access gives the stored gear a dedicated enclosure.

At 30 by 13 by 13 inches, the box fits a smaller storage footprint than a long tongue chest while providing 83.08 liters of stated capacity. Aluminum and fully welded seams support its corrosion-resistant outdoor use, and the 5-bar tread surface adds a durable exterior pattern. A gas strut lid and lock with two keys make opening and securing the contents more convenient; check that this compact size accommodates the gear you carry.

Skip it if you carry bulky gear that needs a longer enclosure; the 30-inch body may not provide enough room.

This EASYBERG suits trailer owners seeking lockable, corrosion-resistant tongue storage in a compact aluminum format. It provides 83.08 liters, but its 30-inch length sets a clear boundary for buyers carrying longer or bulkier equipment.

Listed on Amazon as: 30" Aluminum Trailer Tongue Tool Box with Lock & 2 Keys, Silver

#8

8. VEVOR 36-Inch Tongue Box

• Dimensions: 36"L x 12"W x 12"H
• Material: Steel
• Weight: 28.4 lb

Best for: Compact steel tongue organizer.

Why it ranks #8: This 36 x 12 x 12-inch steel tongue box includes two keys and weighs 28.4 pounds, but its specified placement is the trailer tongue.

A 36-by-12-by-12-inch format gives this VEVOR trailer tongue box a defined space for batteries, tools, and outdoor equipment. Its carbon steel construction and double-sided dusting finish provide a sturdy, finished enclosure, while the included lock and keys help secure contents during travel.

The 36-inch length creates room for common trailer essentials, while the 12-inch width and height keep the listed dimensions compact for tongue-mounted storage. Carbon steel gives the chest its sturdy structure, and the double-sided dusting process adds a finished surface. VEVOR lists a 66-pound maximum weight recommendation, so the box is suited to measured loads rather than unrestricted heavy cargo. Two keys are included for the lockable storage compartment.

Skip it if you need to store loads exceeding 66 pounds; the stated maximum weight recommendation is limited to that amount.

Consider this VEVOR for a trailer owner seeking a compact, lockable steel tongue chest for tools or batteries. Keep the 66-pound maximum weight recommendation in mind when deciding whether it suits the equipment you plan to carry.

Listed on Amazon as: VEVOR Trailer Tongue Box, Heavy Duty Trailer Tongue Tool Box Storage Organizer with Lock & Keys, Utility Tool Chest for Pickup Truck Bed, RV, SUV, Off-Road Vehicle, Steel, 36" x 12" x 12"

#9

9. Fsehyue 26-Inch Tongue Box

• Dimensions: 26"L x 13.3"W x 12"H
• Material: Aluminum

Best for: Weather-sealed tongue storage.

Why it ranks #9: A compact 26 x 13.3 x 12-inch aluminum tongue box, it lists a rubber seal and lock with keys but offers less direct underbody fit.

A rubber sealing strip helps this Fsehyue aluminum tongue box keep water from seeping in when closed, protecting stored essentials in wet conditions. Its 26-by-13.3-by-12-inch diamond-plate enclosure provides a compact space for rope, maintenance tools, a water bucket, or warning equipment.

The 26-inch length and 12-inch height give this box a compact profile for trailer or RV storage, while aluminum construction is listed as rust-resistant for outdoor use. A rubber sealing strip creates a tight closure intended to keep rainwater out, and the lockable design includes two keys for securing contents. Its dimensions suit smaller essentials, so compare the internal storage needs of your rope, tools, and other gear with the available space before choosing it.

Skip it if you need to carry long tools or bulky gear; its 26-inch length creates a compact storage limit.

This Fsehyue suits trailer and RV owners looking for a compact, lockable aluminum tongue box with a water-sealing strip. Its 26-inch length makes it better suited to smaller essentials than long equipment.

Listed on Amazon as: 26×13.3×12 Inch Aluminum Trailer Tongue Tool Box Heavy Duty Storage Box Diamond Plate Toolboxes with Lock and Keys Suitable for Flatbed Trailer Tractive RV Silvery

#10

10. BLACKHORSE-RACING 48-Inch Box

• Dimensions: 48"L x 15"W x 15"H
• Material: Stainless Steel

Best for: Long steel tongue storage.

Why it ranks #10: The 48 x 15 x 15-inch lockable steel box has useful length, but the listing does not establish a flatbed-specific mounting design.

A 48-inch length gives this BLACKHORSE-RACING steel box room for a broad assortment of outdoor gear. Its 48-by-15-by-15-inch dimensions form a long storage chest, while a black powder-coated finish is specified as anti-corrosion and rust-proof for outdoor use.

The 48-inch body offers a long storage area for items needed during outdoor activities, and the 15-inch width and height define the space required on a trailer. Steel construction supplies the enclosure, with a black powder-coated treatment listed to resist corrosion and rust. An internal lock supports secured storage, while a side handle provides a way to handle the box. Its listed material is stainless steel, so factor that specification into installation and placement planning.

Skip it if you have a short tongue or restricted mounting space; its 48-inch body requires a long installation area.

Choose this BLACKHORSE-RACING box if a trailer setup needs a long, lockable chest for outdoor gear. Its 48-inch length is the main fit boundary, so measure the intended mounting area before deciding.

Listed on Amazon as: 48 Inch Steel Truck Tool Box,Heavy Duty Trailer Tongue Box