This Rack Kit is for truck canopies/camper shells/caps and trailers that have roof top sizes no larger than approximately 1425mm/56. 1'' (W) x 954mm/37. 6'' (L). The Slimline II Tray mounts to four (4) supplied Feet that slide in to the supplied Track. The 1150mm/45. 3” long pair of tracks can be easily mounted to your canopy/shell or trailer. See the Track installation instructions in the INSTALL tab for further details. All Front Runner Rack Kits contain installation instructions as well as all the components needed to mount the Slimline II Tray to your vehicle. All Front Runner Racks are backed by a Limited Lifetime Warranty*