Abstract: The present invention relates to an arrangement (1) for a cargo support (2) for trailers. It comprises a connecting means for the detachable attachment of the cargo support (2) to a cargo vehicle and a trailer of the kind in question. Means are provided for the detachable locking of the cargo support (2) to the deck (9) of a vessel. Openings (11-14) in the cargo deck (9) are provided to accommodate locking devices (15-17) that are arranged in the cargo support (2) in question and are capable of actuation causing them to be displaced from locking engagement with the deck (9). In accordance with the invention, the aforementioned locking devices (15-17) are so arranged respectively as to be activated and disconnected automatically through interaction between the cargo vehicle and the cargo support (2).