Pace Edwards created the Elevated Truck Rack to allow you to carry longer supplies high while being able to utilize an UltraGroove series or a Retrax XR series tonneau covers low for smaller items. All you need to do is mount the towers for the bars on the rail expansion system of your compatible tonneau cover, and mount your bars up top. Since the four towers have feet that mount into the RES channels installation is quick and easy as they just slide into the channels. The two crossbars are made by Thule and accept a wide variety of products so you can haul things like kayaks, surfboards, and other larger cargo with ease. With the towers being made of black powder- coated steel, and the bars made of aluminum this rack system is corrision resistant. Regardless of what kind of elements are thrown at it, this truck rack is built to last. Pace Edwards engineers the Elevated Truck Rack in the USA so you know this product is made to the highest standards. | Pace Edwards EL400 Elevated Truck Rack ELC0103