The XR Series combines the PowertraxONE MX with the integrated Trax Rail System that allows for unique and personal customization above your tonneau cover. The PowertraxONE XR electric retractable truck bed cover is part our Polycarbonate Series covers. The XR Series optimizes cargo capacity with the cover open or closed, providing the ultimate versatility in cargo management. The Trax Rail System will work with most T-slot accessories from Rhino Rack, Yakima, Thule, and many more offering endless possibilities. Pairing the Trax Rail System with accessories offers double the cargo capacity. This unique technology frees up the hitch with the ability to mount bikes, coolers, outdoor gear and more on top of the bed cover by combining the Trax Rail system with the t-slot accessories.\nMatte One Piece Polycarbonate Construction\nBefore purchase please verify if you have New Body Style or Legacy (Chevy)/Limited (GMC) on 2019 Silverado/Sierra 1500 -- This part is for the Legacy/Limited Body Style\n2018 Chevrolet Silverado 1500 78.8 Bed, 2014-2017 Chevrolet Silverado 1500 78.9 Bed, 2019 Chevrolet Silverado 1500 LD 78.8 Bed, 2015-2019 Chevrolet Silverado 2500 HD 78.8 Bed, 2015-2019 Chevrolet Silverado 3500 HD 78.8 Bed, 2018 GMC Sierra 1500 78.8 Bed, 2014-2017 GMC Sierra 1500 78.9 Bed, 2019 GMC Sierra 1500 Limited 78.8 Bed, 2015-2019 GMC Sierra 2500 HD 78.8 Bed, 2015-2019 GMC Sierra 3500 HD 78.8 Bed