Abstract: A chock for use in securing four wheel vehicles such as automobiles to the deck-mounted rail of a transport carrier includes a frame, with the frame having a pocket formed and adapted to mount the frame laterally over the deck-mounted rail. The rail has a series of transverse openings and the frame has at least one pin extending from the side of the pocket and positioned to extend through a rail opening. There is a locking member pivotally mounted to the frame on an axis perpendicular to the frame pin or pins. The locking member has a handle portion outside of the frame and a rail engaging portion movable within the pocket and arranged to bear against one side of the rail to secure the frame pin or pins within the rail openings and thus the frame to the rail. There is a latch for holding the locking member in a locking position. A rotatable rod is mounted in the frame and has a tire engaging web attached to it with rotation of the rod tightening or releasing the web.