US Patent 9199673 Aerodynamic rear drag reduction system for a trailer

A drag reduction system is configured to be coupled to a rear frame assembly of a trailer including a rear swing door and a rear frame. The drag reduction system includes a main wall panel configured to be coupled to a vertical member of the rear frame to extend generally rearwardly of the trailer at least partially along a height of the trailer. The main wall panel is pivotable relative to the rear frame between a deployed position wherein the inner surface of the wall panel is spaced-apart from the outer surface of the rear swing door, and a stowed position wherein the inner surface of the wall panel is adjacent to and engaged with the outer surface of the rear swing door.