I just bought a 05 Tahoe in pretty good shape. I suspected it might have had a fender bender because the right side front bumper sags about an inch down but the other side seems fine though. Doing a little googling, I see it's kind of a common problem. Does anyone know the reason why this happens and is there a recommended fix? One guy was putting scrap 2x4 on a hydraulic lift and jacking the bumper back into place. Another was using a long threaded rod to get it pulled up from the bottom of the valance to the body. Any thoughts on that?