7 years on and I've noticed a few screws and bolts have worked loose, particularly on the wheel well liner--the partial one, not the full well liner (I'm still using the frame tubes for tool storage). I'm curious as to what screws and bolts others have noticed that work loose before I do the Big Crawl under my truck to tighten or replace them. I've actually lost two of the bolts from wheel well liners, but I haven't noticed any noises to indicate a problem. One thing that did puzzle me was that somewhere along the line I lost one of the little rubber bumpers that fit on the top leaf spring.