This Rack Kit is for truck canopies/camper shells/caps and trailers that have roof top sizes no larger than approximately 1165mm/45.9" (W) x 1358mm/53.5" (L). The Slimline II Tray mounts to six (6) supplied Feet that slide in to the supplied Track. The 1400mm/55.1" 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.This taller kit has space for mounting the Front Runner tables or other compatible accessories under the rack.