The Enclosed Gooseneck Cargo Trailer also features a thicker side skin and specially designed extrusions to give you a package that is second to none. Some of the many great standard features of the Enclosed Gooseneck Cargo Trailer are: extruded tongue and groove aluminum floor, one piece aluminum roof, side door, full swing rear door and rubber torsion axles with electric brakes. Even though we offer a long list of Standard Features our ability to customize your Enclosed Cargo Trailer is unmatched.