Abstract: A truck or, respectively, truck trailer, in particular with a closed box body, possibly provided with thermal insulation, and a door (3) disposed at the box body and pivotable around hinges with vertical pivot axes, where the hinges are attached at the box body (1), wherein a pivot arm (7), with its pivot hinge (6), extending horizontally over two sides (3a, 3b) below the door (3) at the box body (1) or, respectively, at the vehicle frame (2) is disposed such that the rotation axes (6a) of the pivot arm (7) are aligned with the pivot axes (4a) of the door hinge brackets (4), and where the pivot arm (7) is connectable at its free end (7a) by a bolting device (8) to the box body (1) or, respectively, the vehicle frame (2), and where a ramp (10) or, respectively, (34) is disposed at the pivot arm (7), where the ramp is pivoted around a pivot hinge device (9) and mountable and demountable by way of a bolting device (11) at the door (3), and where this ramp is narrower than the door (3).