Best Underbody Truck Tool Box for Work Trucks and Trailers

#1 · Best Overall

1. Buyers Products 1702310

• Dimensions: 48"L x 18"W x 18"H
• Material: Alloy Steel
• Weight: 104 lb

Best for: Long-capacity steel job storage.

Why it ranks #1: Its 48 × 18 × 18-inch size pairs with 14-gauge steel, a compression latch, continuous hidden hinge, replaceable gasket, and included keys.

A 48-by-18-by-18-inch shell and stated 6.75-cubic-foot capacity make the Buyers Products 1702310 a substantial option for equipment storage. Its 14-gauge steel body, 12-gauge drop door, and stainless compression latch focus on keeping job-site tools secured in a full-length underbody box.

The recessed drop door and stainless compression latch help secure contents while providing access across the box’s 48-inch length; the supplied product facts also specify an unobstructed opening with no center post. A continuous hidden hinge and replaceable gasket system support weather protection and maintenance. The black powder coat covers the interior and exterior, while the listed 104-pound weight means installation calls for planning around a heavy enclosure.

Skip it if you need a lighter box; VEVOR’s 48 x 17 x 18-inch aluminum model is listed at 37.8 pounds.

This suits buyers needing substantial, lockable steel storage for job-site tools and equipment, with a wide opening and replaceable gasket. Plan for the 104-pound listed weight and the 48-inch mounting length.

Listed on Amazon as: Buyers Products 1702310 Black Steel Underbody Truck Tool Box, 18x18x48 Inch

#2 · Aluminum Build

2. VEVOR Underbody Box 48-inch

• Dimensions: 48"L x 17"W x 18"H
• Material: Aluminum
• Weight: 37.8 lb

Best for: Flexible aluminum vehicle storage.

Why it ranks #2: This 48 × 17 × 18-inch aluminum box includes a lock and two keys, plus a rubber sealing strip; its listed weight is 37.8 pounds.

The 48-by-17-by-18-inch aluminum body gives the VEVOR box room for maintenance tools or camping gear while keeping storage options open. Its stated mounting locations include truck or trailer undersides, a camper’s back, and a pickup rack, making it useful beyond a single vehicle position.

A rubber sealing strip helps keep water out when the lid is closed, while the lockable T-handle and two included keys secure stored equipment. The 48-inch length offers space for longer gear, and the aluminum construction keeps the listed weight to 37.8 pounds. Its dimensions call for a substantial mounting area, but the stated use across trucks, trailers, campers, and pickup racks gives owners several placement possibilities.

Skip it if you need a compact 24-inch box; VEVOR’s 48-inch body takes substantially more mounting length.

A good match for truck, trailer, or camper owners who want lockable aluminum storage for tools or camping gear. Account for its 48-inch length and 17-inch width when planning an underbody or alternate mounting location.

Listed on Amazon as: VEVOR Underbody Truck Box, 48"×17"×18" 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

#3 · Compact Steel

3. Buyers Products 1702305

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

Best for: Steel work-truck tool storage.

Why it ranks #3: The 36 × 18 × 18-inch steel box has 14-gauge construction, a stainless compression latch, keys, and a listed 3,401.64-cubic-inch capacity.

Fourteen-gauge steel gives the Buyers Products 1702305 a work-oriented shell for protecting tools, parts, and supplies on trucks, flatbeds, and trailers. Its 36-by-18-by-18-inch dimensions offer a defined storage footprint, while a stainless compression latch pulls the recessed door against its gasket.

The compression latch helps hold the drop door firmly against the gasket, supporting a tighter closure and reducing rattling during travel. A continuous hinge supports the door along its length, while the corrosion-resistant black powder coat helps protect the steel exterior. At 36 inches long, this model uses less length than the 48-inch Buyers Products 1702310, though its 76-pound listed weight is worth factoring into handling and installation.

Skip it if you want a 48-inch steel box; Buyers Products 1702310 provides a longer body for that mounting span.

Choose this Buyers Products box for work-truck, flatbed, or trailer storage where a 36-inch steel enclosure and gasketed locking door suit the job. Its 76-pound listed weight deserves consideration when planning installation.

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

#4 · Smallest Footprint

4. VEVOR Steel Box 24-inch

• Dimensions: 24"L x 12"W x 14"H
• Material: Cold Rolled Steel
• Weight: 24.5 lb

Best for: Compact sealed steel storage.

Why it ranks #4: Its 24 × 12 × 14-inch dimensions suit tighter spaces, while galvanized steel, a powder-coated finish, full-perimeter gasket, lock, and keys are listed.

At 24 by 12 by 14 inches, this VEVOR box offers a compact footprint for underbody storage where a longer chest would be difficult to place. Its galvanized steel construction and powder-coated finish pair with a full-perimeter rubber gasket to help protect contents from outdoor exposure.

The full-perimeter gasket helps block rain and dust at the door, while the seamlessly welded body supports the sealed enclosure. Galvanized steel and a powder-coated finish provide layers of protection against rust and wear, making this a practical choice for exposed vehicle mounting. Its 24-inch length and 12-inch width limit the space it occupies, and the listed 30-kilogram maximum weight recommendation provides a load boundary to observe.

Skip it if you store long equipment; VEVOR’s 48 x 17 x 18-inch aluminum box offers a longer interior span.

Consider this for truck, van, SUV, or trailer owners who need compact, weather-conscious steel storage. Its 24-inch length favors smaller tools and gear rather than long equipment, and the stated 30-kilogram maximum is a load limit.

Listed on Amazon as: VEVOR Underbody Truck Tool Box, 24 x 12 x 14 Inch Heavy Duty Steel Trailer Storage Box with Lock & Keys, Waterproof Trailer Storage Organizer Under Body Chest with T-Handle for Truck, Van, SUV, Black

#5

5. Weetron Underbody Box 48-inch

• Dimensions: 48"L x 14"W x 16"H
• Material: Alloy Steel

Best for: Long welded steel storage.

Why it ranks #5: The 48 × 14 × 16-inch steel box offers a full-welded body, powder coating, T-handle latch, and keys for buyers seeking a narrower full-length option.

The Weetron WT0019 combines a 48-inch length with a fully welded steel body, providing a long enclosure for tools and outdoor gear. Its 14-inch width and 16-inch height give it a slimmer profile than a 48-by-18-by-18-inch box, while a T-handle latch and keys support secured storage.

Fully welded construction supports strength and impact resistance, and the black powder coating is specified for waterproof and corrosion-resistant protection. Those features make the box relevant to camping, transportation, and construction storage, where gear may be carried in exposed vehicle settings. Its 48-by-14-by-16-inch dimensions give it a long but comparatively narrow form; check available mounting space against the width and height before selecting a location.

Skip it if you need more width; Buyers Products 1702310 measures 18 inches wide and 48 inches long.

A sensible fit for truck, tractor, or RV owners seeking a long steel chest for tools or outdoor gear. Its 14-inch width and 16-inch height are important constraints when matching the box to a mounting space.

Listed on Amazon as: 48 Inch Underbody Tool Box,Heavy Duty Underbody Truck Tool Box w/T-Handle Latch and keys for Pickup Truck,Utility Tractor,RV,Waterproof Tool Chest For Storage & Organization-48 × 14 × 16 inch

#6

6. STMGW Aluminum Box 48-inch

• Dimensions: 48"L x 18"W x 18"H
• Material: Aluminum
• Weight: 50 lb

Best for: Wide aluminum flatbed storage.

Why it ranks #6: This 48 × 18 × 18-inch aluminum model lists a cam lock, weather-resistant material features, and a double barn-door design for side access.

The STMGW box pairs a 48-by-18-by-18-inch aluminum body with a double barn door design, giving flatbed users a long storage space and side access. Its cam-lock hardware accepts a separately purchased personal padlock, allowing buyers to choose their own padlock for securing equipment.

The double barn doors provide side access to the 48-inch enclosure, which can help reach tools without opening a single full-width lid. Aluminum construction is specified as corrosion-resistant, while the listing also identifies moistureproof and weathertight features for vehicle storage. Its 50-pound listed weight is a consideration when planning installation, and the cam-lock system requires a separate padlock if keyed personal security is desired.

Skip it if you want keys included; VEVOR UTTB-481718 lists two keys with its lockable T-handle.

This is suited to flatbed owners who want a long aluminum enclosure with side access and control over their padlock choice. Allow for its 50-pound listed weight and source a padlock separately for the cam-lock hardware.

Listed on Amazon as: Aluminum Underbody Truck Tool Box With Cam Lock (48"×18"×18")

#7

7. Vigorighter Steel Box 18-inch

• Dimensions: 18"L x 12"W x 14"H
• Material: Alloy Steel
• Weight: 10.61 kg

Best for: Small-space underbody tool storage.

Why it ranks #7: Its 18 × 12 × 14-inch steel body is a compact underbody option with powder coating, welded seams, a weatherproof gasket, lock, and keys.

The Vigorighter TB0218-BK measures just 18 by 12 by 14 inches, making it a compact underbody option for keeping tools accessible without claiming a long stretch of mounting space. Its steel body, powder-coated finish, and weatherproof gasket address durability and exposure for truck or RV storage.

Fully welded seams and a weatherproof gasket help shield stored tools from outdoor conditions, while the powder-coated steel is specified to resist abrasion and rust. The underbed arrangement can preserve other truck-bed space, and the product facts also identify side or cargo-area mounting as options. Its compact dimensions suit smaller storage needs, but naturally limit the size and quantity of equipment that can fit inside.

Skip it if you need a full-length chest; Weetron WT0019 measures 48 inches long for longer storage needs.

Choose this compact box for a truck or RV needing weather-conscious storage in a limited space, with listed underbed, side, or cargo-area placement. Its 18-inch length is a clear boundary for long tools.

Listed on Amazon as: 18"x 12"x 14" Underbody Truck Tool Box, 18 Inch Heavy Duty Steel Under Body Toolbox for Pick Up Truck RV, Under Mount Tool Box with T-Handle Lock and Keys, Black (18" x 12" x 14")

#8

8. KING CHAO FOO Steel Box 36-inch

• Dimensions: 36"L x 14"W x 16"H
• Material: Iron

Best for: Multi-vehicle modular storage.

Why it ranks #8: The listed 36 × 14 × 16-inch iron box offers a stated 35-gallon capacity and dustproof feature, though latch and construction details are limited.

The KING CHAO FOO box lists a 35-gallon capacity in a 36-by-14-by-16-inch body, offering substantial storage in a format intended for trucks, trailers, vans, and RVs. Its modular mounting description includes top- or side-mount placement on delivery vans, supporting varied vehicle layouts.

A 35-gallon capacity gives this box room for maintenance tools, roadside supplies, or camping gear, while the 36-inch length offers a middle ground between compact chests and longer 48-inch models. The listed modular design supports low-profile mounting across several vehicle types, including top- or side-mount van placement. Iron construction and a dustproof special feature speak to enclosure and contents protection, though the supplied facts do not specify a lock mechanism.

Skip it if you require a specified keyed lock; VEVOR JL-TB17S-2 lists a lock and two included keys.

This suits buyers seeking 35-gallon vehicle storage with mounting flexibility across trucks, vans, trailers, and RVs. The supplied specifications identify dustproof protection but do not state a keyed lock, so it may not suit security-led needs.

Listed on Amazon as: Steel Underbody Truck Tool Box,36 Inch Heavy-Duty Job Box,Heavy Duty Storage Box with Lock and Keys,for Truck,Pickup,Trailers,Van,RV,Black Power coating,Best gift for family and friend

#9

9. YRCHOFQU Steel Box 27-inch

• Dimensions: 27.75"L x 10"W x 11"H
• Material: Iron

Best for: Compact sealed gear protection.

Why it ranks #9: This compact 27.75 × 10 × 11-inch iron box includes two keys and lists airtight, dustproof, and moistureproof features, but provides limited mounting detail.

The YRCHOFQU box measures 27.75 by 10 by 11 inches, providing a compact steel enclosure for hand tools, towing accessories, tie-downs, or recovery gear. Its listed airtight, dustproof, moistureproof, and lockable features target protection in a small underbody format, with two keys included.

Reinforced heavy-duty steel is specified to resist impacts, vibration, and everyday wear during transportation, while the airtight and moistureproof features address exposure concerns for stored tools. Dustproof protection can help keep the interior cleaner, and the lockable design with two keys supports controlled access. Its 27.75-inch length and 10-inch width make the footprint manageable, but the compact dimensions limit larger equipment and long tools.

Skip it if you need a taller chest; VEVOR JL-TB17S-2 measures 24 x 12 x 14 inches.

A fit for buyers storing hand tools, tie-downs, or recovery gear in a compact, lockable enclosure. Its 10-inch width and 11-inch height are boundaries for bulky equipment, despite the listed protective features.

Listed on Amazon as: 27" Underbody Truck Tool Box, Heavy-Duty Steel, Lockable

#10

10. COOLBAG Steel Box 48-inch

• Dimensions: 48"L x 18"W x 18"H
• Material: Alloy Steel

Best for: Two-box fleet storage.

Why it ranks #10: Its 48 × 18 × 18-inch dimensions and lockable, weathertight features suit underbody storage, but the listing gives little construction or installation detail.

The COOLBAG listing specifies a two-pack of 48-by-18-by-18-inch steel toolboxes, giving buyers two large-format enclosures for organizing separate vehicle areas or work gear. Each is presented with a T-handle lock and keys, while the stated use spans pickups, trailers, RVs, and flatbeds.

The pair’s 48-by-18-by-18-inch dimensions provide substantial space in each listed box, and the steel construction suits buyers seeking a rigid storage chest. Lockable and weathertight are the specified special features, supporting secured storage with weather-conscious closure. The listing names a powder-coated finish and under-mount use, so these boxes are oriented toward vehicle storage; account for the full 48-inch length and 18-inch height at each planned position.

Skip it if you only have room for a short chest; Vigorighter TB0218-BK measures 18 x 12 x 14 inches.

This package fits buyers outfitting a pickup, trailer, RV, or flatbed with two large steel storage chests. Check the available space for each 48-inch box; the listing’s dimensions make this a substantial installation.

Listed on Amazon as: 2 Pack Underbody Truck Tool Box, 48"x18"x18" Heavy Duty Steel Storage Chest with T-Handle Lock & Keys, Waterproof Under Mount Toolbox Organizer for Pickup, Trailer, RV, Flatbed, Powder Coated