These highly crafted racks are quick to assemble and install. Rear leg mount brackets attach to the rear panel of the body. Brackets are located at the reinforced outside corner of the box where they can be raised or lowered without hitting tail lights. The height of the rack over the cab can be optimally set for all makes and models of truck or service body. Mount brackets set the legs off 5/8″ from the rear panel to accommodate top opening boxes.