Commercial vehicle construction with load securing for double-deck operation

Disclosed is a commercial vehicle structure (1), in particular a box body of a commercial vehicle, particularly a truck, trailer and / or semitrailer, with a loading space and at least one side wall (5, 6), wherein the side wall (5, 6) at least two vertically extending and having the loading chamber open towards the double-deck rails (8). In order to avoid the known disadvantages of the prior art it is provided that at least one load-securing bar (10) is vertically slidably received in two double-deck rails (8) and held fixed in different heights.