So far we really like these chocks. They are well built. They are robust, come assembled and ready to install. They hold our bikes much better than belts. The bikes remain fairly stable on rough roads and very stable on paved roads. For our first ride, I screwed three of these onto a piece of chipboard that was 3/4 inch thick and 4 feet wide. Two large motorcycles (450cc and 250cc) fit side by side in wheel chocks at the back of the pickup. I then bolted the rig to the bottom of my trailer, which worked well too. So far so good. Thanks.