Locking elements for interchangeable bodies on a vehicle frame

Heavy goods vehicle having interchangeable bodies, especially flatbed bodies, has a chassis consisting of longitudinal beams (1) with fixing plates for mounting the interchangeable body, and transverse beams. Pre-tensioned quick-acting closing devices (10) which are preferably centrally removable via a connecting mechanism are mounted on part of the fixing plates for the direct mounting of the flatbed body via locking elements. Preferred Features: The quick-acting closing devices consist of a receiving element (9) with a pre-tensioned locking bolt (13) mounted on a fixing plate, a bushing (19) for placing on the receiving element, and a locking strip (22) movably held in slits (21) in the bushing and engaging in the locking position behind a shoulder (30) formed on the locking bolt.