Abstract: A body structure, intended more particularly for trucks, comprising a lateral wall consisting of a lower part and an upper part adapted to swing up either above or below the roof, the upper part being entrained by the lower part, by means of an entraining device, either upwardly into its open position or downwardly into its closed position, the structure being improved, from the point of view of its present complex, rather unreliable, and relatively bulky entraining device, which may easily lead to injuries to the operator, in that the device consists of a rack-and-pinion drive located on each side of the lateral wall and guided on side posts, the rack being hinged by means of a lower rod part to a lever arm projecting downwardly in the closed position, from the lower part, and engaging at the top with toothing running along the outside of the hinge location of the relevant lower link, in which toothing, a pinion engages, the pinion being secured to the link axially of the bearing location thereof, the pitch