The XR Series combines the PRO MX with the integrated Trax Rail System that allows for unique and personal customization above your tonneau cover. The RetraxPRO XR, our premium Aluminum Series cover, combines industrial strength aluminum construction with an incredibly resilient matte finish. 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 Yakima, Thule, Rhino Rack 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. RetraxPRO XR Retractable Tonneau Cover - Industrial Strength Aluminum Construction - 2020-2024 Chevy Silverado/GMC Sierra 2500 HD/3500 HD 8' Bed without Factory Side Storage Boxes without Stake Pockets Before purchase please verify if you have New Body Style or Legacy (Chevy)/Limited (GMC) on 2019 Silverado/Sierra 1500 - This part is for the New Body Style 2020-2024 Chevrolet Silverado 2500 HD 98.2 Bed, 2020-2024 Chevrolet Silverado 3500 HD 98.2 Bed, 2020-2024 GMC Sierra 2500 HD 98.2 Bed, 2020-2024 GMC Sierra 3500 HD 98.2 Bed