in hindsight I should have bought supports that offer 28lbs of lift not the 40lbs they offer. As a previous reviewer said, the sunroof on the top of my truck almost took my chin off the first time it opened! But now that I'm used to them, I love them. I drove almost 30 minutes yesterday with the sunroof open because I had a couch hanging out of my bed; there were no problems at all. These props kept it completely open. Don't worry about it falling off and tearing the fabric on the sofa.