E Track Shelf Bracket KitE Track Shelf Bracket Kit Custom Trailer Storage Made Easy Turn your enclosed trailer into a functional workspace or organized cargo area with this E Track Shelf Bracket Kit. Designed for flexibility, it includes everything you need to install shelves, tire racks, workbenches, or fold down storage using your own 2x4 or 2x6 lumber. The wood beam sockets clip directly into the E Track rails and can be permanently secured using the included fasteners.