Ensure your semi truck is Ready for the Road Ahead™ with increased storage space, with the Buyers 18" x 18" x 36" Diamond Tread Aluminum Underbody Truck Box. Thanks to its secure design, this replacement box is able to offer an additional space to store tools, equipment, backup materials, and important items. Crafted with a weather-resistant and durable body to tolerate extreme conditions. FleetPride is your First Click in Heavy Duty®.