Tarpaulin body of a commercial vehicle, in particular a truck, trailer or semi-trailer, having a floor, a longitudinal beam of a roof provided on a longitudinal side of the tarpaulin body, at least one central stanchion connected to the longitudinal beam and at least one side canvas for closing the longitudinal side of the tarpaulin body, wherein the connection between the at least one central stanchion and the longitudinal beam is provided so as to be adjustable from a position of use for supporting the roof relative to the floor into a position of non-use for displacing the central stanchion along the longitudinal beam and back again, wherein the longitudinal beam comprises at least one beam latch on an inner side facing towards the cargo area or on an outer side facing away from the cargo area, wherein the at least one central stanchion comprises a stanchion latch corresponding to the beam latch on an inner side facing towards the cargo area or on an outer side facing away from the cargo area, wherein at least one stanchion latch and at least one beam latch are engaged in a form-fitting and/or frictionally fitting manner in at least one longitudinal direction of the longitudinal beam in the position of use and disengaged in the position of non-use, characterised in that - the longitudinal beam can be sectionally raised and lowered, such that the connection between the at least one central stanchion and the longitudinal beam is formed for adjustment from the position of use into the position of non-use by sectionally raising the longitudinal beam relative to the at least one central stanchion and/or the connection between the at least one central stanchion and the longitudinal beam is formed for adjustment from the position of non-use into the position of use by sectionally lowering the longitudinal beam relative to the at least one central stanchion, - the at least one beam latch and/or the at least one stanchion latch comprise at least one guiding surface (33,34) for positioning the at least one beam latch with respect to the at least one stanchion latch when adjusting from the position of non-use into the position of use and - the at least one guiding surface (33,34) is tilted in the longitudinal direction of the longitudinal beam. - the longitudinal beam can be sectionally raised and lowered, such that the connection between the at least one central stanchion and the longitudinal beam is formed for adjustment from the position of use into the position of non-use by sectionally raising the longitudinal beam relative to the at least one central stanchion and/or the connection between the at least one central stanchion and the longitudinal beam is formed for adjustment from the position of non-use into the position of use by sectionally lowering the longitudinal beam relative to the at least one central stanchion, - the at least one beam latch and/or the at least one stanchion latch comprise at least one guiding surface (33,34) for positioning the at least one beam latch with respect to the at least one stanchion latch when adjusting from the position of non-use into the position of use and - the at least one guiding surface (33,34) is tilted in the longitudinal direction of the longitudinal beam.