This kit creates a full size rack on truck canopies/camper shells/caps and trailers that have roof top sizes of approximately 1345mm/53 (W) x 2166mm/85.3 (L). The Slimline II Tray mounts to supplied Feet that slide in to the supplied Track. The track can be easily mounted to your canopy/shell or trailer. See the Track installation instructions in the INSTALL tab for further details.