Large Poly Triangle Trailer Box

The DEE ZEE Large Poly Triangle Trailer Box (Model DZ 91717P) is a purpose-built storage solution for mechanics, fleet operators, and serious DIYers who need secure, weatherproof tool and parts organization on the road. This triangular trailer box maximizes dead space on your towing setup while keeping contents protected from the elements. Built by DEE ZEE—a trusted name in automotive storage and accessories—this unit delivers industrial-grade reliability.

Constructed from durable polyethylene, this large poly triangle box resists rust, corrosion, and UV degradation—critical advantages over metal boxes exposed to salt spray, moisture, and temperature swings. The seamless poly construction and integrated latch system provide a moisture barrier that keeps tools dry and prevents rattling during highway transport. The compact design ensures that it does not interfere with visibility or towing clearance.

This model works best on single-axle trailers, utility trailers, and truck frames where space optimization is essential. Weighing 25 lbs, it is significantly lighter than comparable steel or aluminum boxes, reducing tongue weight strain on lighter-duty towing vehicles and improving fuel economy. The triangular geometry fits snugly between frame rails and wheel wells, utilizing space that would otherwise go unused.