Product Description
Semi-Trailer Crossover Underbody Cargo Boxes: Underbody storage that stays water-tight and theft-resistant on the road. Made in the USA by AMERICAN TRUCKBOXES ATB®️.
The A-CG51 is a super heavy-duty aluminum cargo toolbox built for semi truck and trailer operators who haul chains, binders, wood blocks, and the loose tools a working trailer needs every day. It mounts under the trailer frame or deck and keeps your gear dry and secured behind stainless steel locks. Every A-CG51 is manufactured by American Truckboxes LLC in Blanchard, North Dakota. Custom sizing and fleet orders are available direct from the factory.
This Semi Cargo Box is an Aluminum Truck Toolbox that is Made in USA and sized for real trailer work.
- Stays dry in any weather: smooth aluminum body with a rain gutter and durable bulb-type automotive door gaskets for a positive weather-tight seal.
- Resists break-ins: stainless steel Dolphine Tail T-handle locks with reinforced frame corners.
- Holds up under load: stainless steel continuous hinges and heavy-duty cable or chain door supports.
- Fits your trailer: thirteen sizes ranging from 18″ to 34″ tall, 42″ to 101″ deep, and 18″ to 72″ wide. Wider Boxes are reinforsed top and bottom.
- Mounts out of the way: designed to hang under the trailer frame or beneath the deck.
- Built to last: all-aluminum diamond tread and smooth finish construction that outlasts the trailer.
- Door styles to match the job: both-end drop-open and side-open door configurations across the range.
Specifications
Material: .125 Aluminum
Dimensions: 18″ to 34″ H, 42″ to 101″ D, 18″ to 72″ W
Mounting: Under trailer frame or deck - Use M2600UD Series Brackets for under Trailer Mounts.
Warranty: 60-month (5-year) limited warranty for standard boxes
American Truckboxes has manufactured heavy-duty truck storage in the USA for over 25 years. For custom sizing, fleet orders, or questions, visit truckbox.com or call (888) 996-0376.
Frequently Asked Questions
Q: Where is this toolbox made?
A: Every A-CG51 semi cargo box is made in the USA at the American Truckboxes LLC factory in Blanchard, North Dakota. ATB®️ has manufactured heavy-duty truck storage for more than 25 years. Learn more at truckbox.com.
Q: What warranty comes with this toolbox?
A: Standard boxes carry a 60-month (5-year) limited warranty. For full details, visit truckbox.com or call (888) 996-0376.
Q: Can I order a custom size?
A: Yes, custom sizes are available direct from American Truckboxes. Custom and modified boxes carry a 12-month warranty. Call (888) 996-0376 or visit truckbox.com to specify your dimensions.
Q: Will this cargo box fit my semi trailer?
A: The A-CG51 comes in thirteen sizes spanning 18″ to 34″ tall, 42″ to 101″ deep, and 18″ to 72″ wide, so most trailer frames and deck clearances are covered. If none of the stock sizes fit your trailer, American Truckboxes can build to your dimensions.
Q: Is this toolbox weatherproof?
A: The A-CG51 uses a smooth aluminum body with concealed rain gutters and bulb-type automotive sealing gaskets to keep water out. The result is a weather-tight closure that protects chains, binders, and tools mounted under an open trailer.
Q: How does the lock system work?
A: Each box uses stainless steel Dolphine Tail DT T-handle Single or double locks, lockable and paired with reinforced frame corners and stainless steel continuous hinges for break-in resistance. Contact ATB®️ at (888) 996-0376 with questions about a specific size.
Q: Does this box mount under the trailer?
A: Yes. The A-CG51 is designed to mount under the trailer frame or beneath the trailer deck, keeping cargo storage off the deck and out of the way. Reach American Truckboxes at truckbox.com for mounting guidance. Use M2600UD Series Brackets for under Trailer Mounts.