Abstract: A transportable merchandise display system comprising a plurality of vertically hinged display wall elements which are supported by on the bed of a truck, trailer or other vehicle. For transport, the wall elements are carried in a collapsed configuration occupying little space. The system is deployed for display by opening the wall elements into an expanded configuration to selectively form either a three-sided display enclosure or flat display panel. Roof elements hinged to each wall element swing upwardly with pneumatic struts to form a three-sided enclosure which is protected from above. Alternatively, the wall elements may be swung fully open to form a vertical display wall, with the roof elements forming a protective horizontal awning-like cover. In one embodiment, the system is carried within an enclosed truck body on a sliding base which extends rearward in cantilever fashion for supporting the display structure in open configuration.