The present invention relates to a commercial vehicle - box body (1), of a surface element with a panel (6) which, when viewed in cross section a with respect to a centrally arranged, of a foamed plastic core layer (7) symmetrical design has, in which, on two opposite sides of the core layer (7) in each case one of more than one layer and formed with the core layer (7) a intermediate layer (8a, 8b) and on the of the core layer (7) side facing away from the respective intermediate layer (8a, 8b) in each case a with the intermediate layer (8a, 8b) connected in a materially joined fashion, dimensionally rigid structure position (12a, 12b) is. According to the invention, the box body (1) has, with an optimized weight and use properties of an optimal dimensional stability. This is achieved by the fact that the thickness of the intermediate layers (8a, 8b) is smaller than the thickness (d12) of the structure layers (12a, 12b) is that the intermediate layers (8a, 8b) in each case two made of a polymer material, existing connection layers (9,11), of which the one in a materially integral manner on the structure layer (12a, 12b) and the other in a materially integral manner to the core layer (7) is connected, and that between the connection layers (9,11) of the intermediate layer (8a, 8b) a gas-impermeable barrier layer (10) is arranged, which to the adjacent connection layers (9,11) is joined by material and a thickness (d10), at the most equal to the thickness (d9,11) of the connection layers (9,11) is.n="21"
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