Abstract: A sliding and locking system is adapted to be mounted around a vehicle straightening bench for supporting a force applying structure. The sliding system includes a pair of spaced rollers adapted to ride on lateral flanges of a vehicle supporting beam, the wheels being mounted at the end of a transverse beam supporting the force applying structure. The transverse beam supports a locking system provided with lever arms adapted to tighten the truss beam on the transverse beam while releasing the roller from the truss beam. The truss beam is subdivided into two superposed transverse beams adapted to pivot relative to one another, one of which pivots relative to the truss beam.