A method for supporting a process of coupling a transportation vehicle (1) to a trailer (3) wherein a position of a coupling element (5) on the trailer is detected by a trailer coupling assistant (4)and the transportation vehicle (1) is at least partly autonomously maneuvered into a target position in which a trailer coupling (6) of the transportation vehicle is disposed in a specified positionfor coupling to the coupling element (5) on the trailer, wherein a rearward monitoring region (B) of the transportation vehicle (1) is monitored by a parking aid (7) during the maneuvering process. The parking aid (7) is operated in a standard mode in response to the trailer coupling assistant (4) being deactivated and the parking aid is operated in a coupling mode in which obstacle warnings relating to the rearward region (B) are output by the parking aid (7) differently from in the standard mode in response to the trailer coupling assistant (4) being activated. The invention also provides asystem (2) used for supporting a coupling process of a transportation vehicle (1) to a trailer (3).