39 in Heavy Duty Aluminum Truck Bed Tool Box Underbody Flatbox

In this review of the 39 in Heavy Duty Aluminum Truck Bed Tool Box, the bottom line is simple: it is a practical, lightweight storage solution for truck, trailer or RV owners who need weather-resistant organization without adding much weight. The box's standout quality is its aluminum construction with a 5 bar tread pattern and a seal ring design that helps keep tools dry and the interior clean. For those who value durability, low weight and a lockable option, this model deserves consideration.

Key Features

• High-strength aluminum: The 5 bar tread pattern and aluminum construction provide a corrosion-resistant exterior that holds up to regular outdoor use.
• Weather-resistant lid: An overlapping lid design with a seal ring reduces the chance of rainwater entering and helps protect stored items.
• Lightweight design: The aluminum construction keeps added weight low so it is easier to mount on trailers, truck beds or RV tongues.
• Lock and keys included: A built-in lock with two keys offers basic security to prevent items from falling out or being taken when parked.
• Powdercoated finish: The silver powdercoated surface improves appearance and adds a protective layer to the metal.
• Compact capacity: At 39 in by 13 in by 10 in, it provides usable storage for hand tools, straps and small accessories without taking excessive space.

Who It's For

This tool box is aimed at truck, trailer and RV owners who need an underbody or tongue-mounted storage option that is lighter than steel and resists corrosion. It works well for users who store tools, bungee cords, tie-downs and small maintenance items, and for those mounting a box on a hitch rack or cargo rack where weight matters.

It is less suitable for buyers who need heavy-duty theft resistance or a rustproof guarantee without occasional maintenance, and those who require large capacity bulk storage should look for bigger or welded steel options.

Pros & Cons

Pros

• Durable aluminum construction with 5 bar tread adds strength while keeping weight down.
• Weather-resistant overlapping lid and seal ring help protect contents from rain and dirt.
• Includes a lock and two keys for basic security and peace of mind during travel.

Cons

• Some users report latch and hardware quality issues on arrival, and light scratches or rusted hardware have been noted.

Specifications

Overall size	39 in x 13 in x 10 in
Material	Aluminum with 5 bar tread
Finish	Powdercoated silver
Seal	Seal ring with overlapping lid
Security	Lock with 2 keys included
Mounting	Underbody, hitch rack, trailer tongue or RV rear mount

Our Verdict

The 39 in aluminum flatbox is a sensible, value-oriented choice for owners who need lightweight, weather-resistant storage on a truck, trailer or RV. It balances corrosion resistance and low weight with a lockable lid, making it a good buy for everyday tool and accessory storage, provided buyers inspect latches and hardware on delivery.

Frequently Asked Questions

Will this box keep tools dry?
The overlapping lid and seal ring design help protect contents from rain and dirt, though proper installation and periodic inspection of the seal are recommended.

Can it be mounted on a trailer tongue?
Yes, the box is suitable for mounting on a trailer tongue, hitch rack, cargo rack or the rear of an RV for extra storage.

Does it include a lock?
Yes, the box ships with a lock and two keys for basic security.