X Chock or Fastway One step Chock

I made these from scraps of 2 X 4, some threaded rod, washers and nuts. Its very easy to do, and they work very well. The picture shows large wing nuts on the chocks. That didn't work out as well as I had hoped. I could not get them as tight as I wanted so I switched them out for hex nuts. Tightening the nuts with a wrench works better.

http://i1211.photobucket.com/albums/cc423/kraigman/Camper%20Modifications/th_wheelchock001.jpg