HEAVY DUTY. That says all you need to know. Dee Zee's Heavy Truck line has incorporated the finest materials, crasftsmanship, and big-rig know how to offer the top of the line heavy duty product family available on the market. Cab Accessory Racks, Underbed Boxes, Side Step Boxes, Frame Steps, and other storage units are available to you, along with the peace of mind that comes with knowing you own the best.