To generate more storage options, you should look at the updated Elevate rack system. This rack system is engineered to be the perfect complement to tonneau covers such as the Extang Xceed, BAK Revolver, Truxedo Roll - Ups, and other covers that mount inside your truck's bed rails. The rack is also perfect for trucks equipped with a Retrax XR tonneau covers, as it can install directly into the cover's T-Slot rails. The rack - whether you get the CS or the FS rack it has an adjustable height of 18, 23 or 28 inches. Set at 18 inches, it provides easy access and a lower profile look. At 28 inches, it gives you complete cab clearance when it is required for the hauling of larger objects. This rack has the flexibility of being installed, adjusted, or taken off in a matter of minutes.