Body structure for truck or trailer

The box-shaped closed superstructure (2) for trucks and truck trailers comprises at least one side wall (1) with slidable and foldable doors (9) and slidable struts (5) supporting a roof (7) on a floor (8). The roof with foldable elements is also partly or completely openable. An independent claim is also included for a truck or a truck trailer with such a superstructure.