Retrax makes a variety of premium retractable bed covers for your GMC truck. Their low profile design, along with scratch resistant finishes give you the best looking tonneau cover on the market along with unbeatable security and ease of use. Certain models use the Trax Rail System for attaching cross bars, racks, and other accessories. This system is perfectly matched to mount an overland bed rack from Leitner Designs. Their ACS Forged Tonneau Rack is one of the few bed rack systems on the market that work with a tonneau bed cover.