E-Track straps have either a ratchet buckle or cam buckle. These ratchet straps and cam buckle straps are used inside your enclosed trailer and connect to E-track which is mounted to the wall. Typically E track is mounted horizontally with horizontal E-track or vertically using vertical E-track or slotted side posts. Standard lengths for 2-inch wide webbing E-Track straps are 12, 16 and 20 feet long. Standard fixed end length is 4 feet.