Best Small Underbody Tool Box for Trucks and Trailers

#1 · Best Overall

1. Fsehyue 16-Inch Aluminum Box

• Dimensions: 16"L x 7.5"W x 10"H
• Material: Aluminum

Best for: Extra-small aluminum compartments.

Why it ranks #1: Its 16 × 7.5 × 10-inch dimensions are the smallest listed, and aluminum construction, a rubber sealing strip, and included keys suit compact outdoor storage.

At 16 × 7.5 × 10 inches, this Fsehyue aluminum toolbox has a compact, narrow footprint for pickup, RV, or trailer storage. A rubber sealing strip and overhanging door lip work together to help keep water out, while the foldable top handle collapses to save space when the box is positioned or handled.

The 16-inch length and 7.5-inch width suit smaller tools and accessories better than bulky equipment, making the listed dimensions important when planning underbody placement. Aluminum construction is described as sturdy and durable, while the rubber seal and overhanging door lip provide two specified ways to guard against water ingress. The foldable top handle collapses neatly to save space, and the lockable design with keys helps secure stored items. Its silver finish and 10-inch height complete the compact format.

Skip it if you need to store broad or bulky equipment; the 7.5-inch width gives this box a narrow storage profile.

Choose this Fsehyue for small tools or accessories when a narrow aluminum box fits the pickup, RV, or trailer mounting area. The 7.5-inch width is the main limit for larger gear.

Listed on Amazon as: 16 Inch Aluminum Truck Tool Box Pickup Small Truck Bed Toolbox Heavy Duty Waterproof Box Trailer Underbody Toolbox with Lock and Keys (16"x7.5"x10") Suitable for Pickup RV Trailer Silver

#2 · Lightest Listed

2. TBAPFS 16-Inch Aluminum Box

• Dimensions: 16"L x 7.5"W x 10"H
• Material: Aluminum
• Weight: 5.5 lb

Best for: Lightweight tread-patterned storage.

Why it ranks #2: The 16 × 7.5 × 10-inch aluminum box weighs 5.5 pounds and has a black tread-pattern finish, making it a compact, lightweight choice.

Weighing 5.5 pounds, the TBAPFS offers a lightweight aluminum enclosure in a compact 16 × 7.5 × 10-inch size. Its black powder-coated exterior has a tread pattern, and the supplied details describe the box as corrosion-resistant and water-resistant, making it a practical option for smaller truck or trailer storage.

The 5.5-pound weight keeps the box itself light, while its 16-inch length and 7.5-inch width define a narrow storage area for smaller tools and accessories. Aluminum alloy construction is described as high-strength and corrosion-resistant, and the black powder-coated tread-pattern exterior adds a durable surface. The supplied details also call it lightweight and well sealed for safety, with a lockable feature listed. These features suit buyers seeking compact storage, not a broad enclosure for bulky equipment.

Skip it if you need to stow wide tools or bulky equipment; the 7.5-inch width limits the usable space.

This TBAPFS is for buyers prioritizing a lightweight, narrow aluminum box for small tools in a truck, trailer, garage, or home. Its 16 × 7.5 × 10-inch dimensions set a clear storage boundary.

Listed on Amazon as: 16 Inch Aluminum Tool Box Black 5 Bar Tread Trailer Truck Bed

#3 · Low-Profile Pick

3. FGJQEFG 20-Inch Aluminum Box

• Dimensions: 20"L x 12"W x 9.5"H
• Material: Aluminum
• Weight: 9.9 lb

Best for: Lightweight aluminum shallow storage.

Why it ranks #3: Its 20 × 12 × 9.5-inch dimensions offer a lower profile than the 18 × 12 × 14-inch steel boxes, with aluminum construction and a seal-ring design.

At 9.9 pounds, this FGJQEFG aluminum box keeps its own weight modest while offering a 20 × 12 × 9.5-inch storage footprint. Its overlapping lid and seal-ring design are intended to help keep rainwater and other unwanted leakage away from stored tools, making it a weather-conscious option for outdoor use.

The aluminum construction is described as corrosion-resistant and lightweight, which limits added vehicle weight compared with a heavier box while retaining an outdoor storage enclosure. Its 20-inch length gives tools more horizontal room than the 9.5-inch height suggests, so it suits flatter gear better than tall equipment. An overlapping lid and seal ring help protect contents from rainwater and keep the interior cleaner. A lock and keys are identified in the title for securing the box.

Skip it if you need to stow tall tools upright; the 9.5-inch height is restrictive for taller equipment.

Choose this FGJQEFG when a lightweight aluminum box with a 20-inch span suits flatter outdoor gear. Its shallow 9.5-inch height is the key boundary, and the listed lock and keys add a way to secure contents.

Listed on Amazon as: 20 Inch Tool Box Flatbox Truck Car Outdoor Trailer Pickup Underbody Toolbox,RV Storage Organizer,Underbed Tools Organizer W/Lock & Keys, Black Aluminum 5 Bar Tread(20''X12''X9.5'')

#4 · Compact Deep Box

4. LULU 16-Inch Aluminum Box

• Dimensions: 16"L x 12"W x 14"H
• Material: Aluminum
• Weight: 14.3 lb

Best for: Compact aluminum bed-space saver.

Why it ranks #4: The 16 × 12 × 14-inch aluminum box stays short in length while listing 1.55 cubic feet of capacity and a lockable design.

An underbody mounting layout lets the LULU CARGO CONTROL box add storage without taking up truck-bed cargo area. Its 16 × 12 × 14-inch aluminum enclosure is described as lightweight and corrosion-resistant, while the lockable feature supports secured storage for items kept beneath a pickup or trailer.

The 16 × 12 × 14-inch dimensions and listed 1.55-cubic-foot capacity give buyers concrete measures for deciding whether their tools fit. Mounting beneath a pickup or trailer preserves cargo space above, according to the product details, while aluminum construction is described as lightweight and corrosion-resistant to limit added weight and protect against corrosion. The lockable feature helps secure stored gear. At 14.3 pounds, the box itself is light enough to distinguish from a heavier steel enclosure.

Skip it if you need to store long equipment inside the box; its 16-inch length limits the available span.

This LULU CARGO CONTROL suits buyers seeking lockable aluminum storage beneath a pickup or trailer while keeping the bed clear. Its 16 × 12 × 14-inch dimensions define the fit boundary for stored gear.

Listed on Amazon as: LULU CARGO CONTROL 16x12x14inch Aluminum Underbody Truck Tool Box, Lockable

#5 · Wide Aluminum Box

5. Fsehyue 18-Inch Aluminum Box

• Dimensions: 18"L x 14"W x 12"H
• Material: Aluminum

Best for: Diamond-plate aluminum utility.

Why it ranks #5: At 18 × 14 × 12 inches, this lockable aluminum box is wider than several compact choices and lists airtight and weathertight features.

A patterned diamond-plate surface gives this 18 × 14 × 12-inch Fsehyue box a textured aluminum exterior that the supplied details say adds stability, wear resistance, and friction. That combination supports underbody storage where surface durability and a less slippery exterior matter, with a lock and keys for securing tools.

The aluminum body keeps the enclosure in a different material category from steel boxes, while its black powder coating is described as durable and long-lasting. The patterned plate is said to improve structural stability and wear resistance, and its added friction can help prevent sliding when driving or placing the toolbox. At 18 × 14 × 12 inches, it offers a compact rectangular storage area. Airtight and weathertight features, plus a lock and keys, support outdoor tool storage.

Skip it if you need a storage box for long-handled equipment; its 18-inch length limits the available span.

This Fsehyue fits buyers seeking a compact aluminum box with a textured diamond-plate surface for truck, RV, ATV, or trailer storage. Check the 18 × 14 × 12-inch envelope against the tools you plan to stow.

Listed on Amazon as: 18×14×12 Inch Aluminum Underbody Truck Tool Box Heavy Duty Diamond Plate Tool Boxes Pickup Storage Box with Lock and Keys Suitable for Truck Bed Pickup RV Trailer Black

#6

6. VEVOR 18-Inch Steel Box

• Dimensions: 18"L x 12"W x 14"H
• Material: Cold Rolled Steel
• Weight: 19.6 lb

Best for: Sealed steel compact storage.

Why it ranks #6: This 18 × 12 × 14-inch steel box has a full-perimeter rubber gasket, powder-coated finish, lock and keys, and a listed 66.1-pound capacity.

A full-perimeter rubber gasket and seamlessly welded body give this 18 × 12 × 14-inch VEVOR box a weather-conscious enclosure for underbody tool storage. Its galvanized steel construction and powder-coated finish add protection against wear and rust, while the lock and two keys let you secure stored gear.

The compact 18 × 12 × 14-inch footprint suits buyers seeking a defined storage space beneath a truck, van, SUV, or trailer rather than a long bed-spanning chest. A full-perimeter rubber gasket and welded body help keep rain and dust away from contents, reducing exposure during outdoor use. Galvanized steel with a powder-coated finish brings impact resistance and rust-and-wear protection, and the stated 66.1-pound capacity sets a clear limit for loading tools.

Skip it if you need a long enclosure for oversized equipment; its 18-inch length and 66.1-pound capacity define a more compact load.

Choose this VEVOR for tools that fit a compact 18 × 12 × 14-inch steel enclosure and need a gasketed, lockable place outdoors. Its stated 66.1-pound capacity is the relevant boundary for heavier loads.

Listed on Amazon as: VEVOR Underbody Truck Tool Box, 18 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

#7

7. Vigorighter 18-Inch Steel Box

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

Best for: Flexible steel mounting options.

Why it ranks #7: Its 18 × 12 × 14-inch alloy-steel body includes a powder-coated finish, welded seams, weatherproof gasket, T-handle lock, and keys.

Mounting flexibility is the Vigorighter 18 × 12 × 14-inch steel box’s defining practical feature: supplied facts describe under-bed, side, or cargo-area placement. That gives truck owners more than one storage location to consider, while its lockable, dustproof construction keeps tools organized and within reach.

The 18 × 12 × 14-inch size offers a compact footprint for tools and accessories, and the underbody format can preserve open truck-bed space. Its steel body has a powder-coated finish, welded seams, and a weatherproof gasket, features stated to resist abrasion and rust and help seal out weather. The lockable design adds security for stored gear. Mounting can be beneath the bed, along the side, or in the cargo area, according to the supplied description.

Skip it if you need to store long equipment in the box; the 18-inch length limits the available interior span.

This Vigorighter suits owners who want a compact lockable steel box and flexibility to consider under-bed, side, or cargo-area placement. Its 18-inch length is a meaningful fit boundary for longer 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. Spaross 18-Inch Steel Box

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

Best for: Lockable steel jobsite storage.

Why it ranks #8: The 18 × 12 × 14-inch steel box includes a lock and keys and lists waterproof storage, though its dimensions are larger than the top compact picks.

Solid steel construction is the Spaross box’s defining feature for buyers who want a rugged, lockable enclosure for tools in transit or at a worksite. Its 18 × 12 × 14-inch dimensions keep the format compact, while the included lock and keys support secured storage on trucks, RVs, and trailers.

The 18 × 12 × 14-inch shape offers a compact underbody storage area for tools and camping or construction gear, with less room for long equipment than a wider or longer chest. Spaross describes its solid steel construction as suited to rough handling and harsh weather. A lock and keys help protect tools during transportation and storage, while the listed waterproof feature supports weather-conscious use. The easy-to-install feature is also identified in the supplied specifications.

Skip it if you need to store long tools in one enclosure; the 18-inch length restricts the available span.

Choose the Spaross for compact, lockable steel storage on a truck, RV, or trailer, particularly for tools carried to camping or construction work. Its 18-inch length is the main fit boundary.

Listed on Amazon as: Spaross 18 Inch Underbody Tool Box, Heavy Duty Steel Waterproof Storage Box with Lock & Keys for Camping, Transportation, Construction, Storage & Organization,18"x 12"x 14",Black

#9

9. Eivojor 27.5-Inch Steel Box

• Dimensions: 27.5"L x 10"W x 11"H
• Material: Alloy Steel

Best for: Narrow steel underbody fit.

Why it ranks #9: Its narrow 10-inch width and 11-inch height may fit some restricted spaces, but the 27.5-inch length is less compact than higher-ranked choices.

A 10-inch width makes the Eivojor a notably narrow 27.5 × 10 × 11-inch steel storage option for buyers working around limited underbody space. Its black powder-coated surface is described as resisting rainwater infiltration and corrosion, while the lockable box mounts at the truck base to preserve storage space elsewhere.

The 27.5-inch length provides a longer storage run than a very short box, while the 10-inch width and 11-inch height keep the stated dimensions relatively narrow and shallow. That shape may suit tools that fit along a vehicle base without needing a broad chest. Powder-coated alloy steel is described as helping prevent rainwater infiltration and corrosion, and the built-in structure is said to prevent lid scratches while driving. A stainless-steel compression lock is also noted in the supplied facts.

Skip it if you need a wide enclosure for bulky equipment; its 10-inch width and 11-inch height constrain the storage envelope.

This Eivojor suits buyers seeking a narrow steel box to mount at a truck base, with a lock and powder-coated surface. Its 10 × 11-inch cross-section is the main boundary for the gear it can hold.

Listed on Amazon as: Heavy Duty Underbody Tool Box Truck Bed Storage with T-Handle Lock Black Steel Smooth Surface Truck Tool Box for Truck,Pick Up,RV,Trailer,27.5 x 10 x 11 inch

#10

10. VEVOR 36-Inch Aluminum Box

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

Best for: Long aluminum cargo storage.

Why it ranks #10: At 36 × 14 × 16 inches, this aluminum box is substantially longer and larger than the small-format choices, so it fits the search less closely.

The 36-inch length is the defining advantage of this VEVOR aluminum box, providing a broader underbody storage span for tools or camping equipment. Its 36 × 14 × 16-inch dimensions and 110-pound maximum weight recommendation make it a larger-capacity choice than compact boxes, while a rubber sealing strip and lock support protected storage.

The 36-inch length creates room for longer items that may not fit in a small 18-inch box, while the 14-inch width and 16-inch height define the remaining storage envelope. VEVOR describes installation beneath trucks and trailers or at a camper’s back or pickup rack, allowing different storage locations. Aluminum is listed as rust- and corrosion-resistant, waterproof, and scratch-resistant; a rubber sealing strip helps prevent water entry when closed. The lock and two keys secure the contents.

Skip it if you have room only for a short underbody box; the 36-inch length needs a wider mounting area.

Choose this VEVOR for truck, trailer, or camper storage when a 36-inch aluminum enclosure suits the available mounting area. Its longer body is useful for extended gear but is the key space-fit consideration.

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