An apparatus for restraining an object in a vehicle may have a frame mounted within the vehicle, a clamp member movably mounted to the frame and a blocking member movably mounted to the frame. The frame may have a first end and a second end opposite the first end. The clamp member may be movable relative to the frame under quasi-static conditions to allow the object to be received between, and removed from between, the clamp member and the second end of the frame. The blocking member may be configured to move relative to the frame under dynamic loading conditions to a position that blocks movement of the clamp member sufficiently to retain the object between the clamp member and the second end of the frame under the dynamic loading conditions.