Steve, I've used them quite often (lots of lumber, appliances, etc. ) and never had any trouble with them. I use medium sized ratchet straps, so I put a decent load on them. As long as you make sure they are screwed in tight to the truck, you shouldn't have a problem. When I put mine on I also installed diamond plate bed rail caps that had a protective foam underneath. For the first couple of months I had to periodically tighten the hooks, but that was because the foam underneath the bed rail caps was relaxing. I haven't had to tighten them any since.