Abstract: A compact rear fairing to reduce the drag incident to relatively high speed movement of box-like bodies, such as trucks, trailers and cargo containers, is provided. The structure of the fairing is substantially rigid and, depending on the use thereof, is formed with two or more outer surfaces shaped in the contour of the upper surfaces of an air foil, the leading surfaces of which are mountable adjacent the rear of the box-like body and the trailing surfaces thereof being joined together to form an apex at its rear.The fairing is readily mounted on and detached from the box-like bodies and interchangeable between trucks, trailers, and containers of the same size.