Abstract: A clamp to be placed against payload objects carried in a truck or other vehicle including a corrugated bed liner comprising one or more pairs of movable opposing jaws, each pair selectively engaging a portion of the truck bed liner. The clamp jaws are slidebly retained in grooves in a clamp frame, and moved by spirally disposed grooves in a disk rotated by a connected operator lever. Further improvements include anchoring apertures to further secure the object(s) with rope or strapping, and latching apparatus to maintain the clamp in a closed or “engaged” position relative to the bed liner.