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. Check out our Accessory Compatibility Chart to find the accessory that is best for you! (Accessories Sold Separately) 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. Selling only truck bed cover. Other accessories not included. I show the pictures to demonstrate what this cover can do. It is an incredible cover!