One of my trucks has been riding rough for a while. Not hard to diagnose when you crawl under the truck and find rust holes in the shock absorbers. One was completely broken in two. All that held it together was the rubber boot. They were 11 years old with about 80k miles. Those shocks started out life white. I believe the rubber boots probably accelerated the rust....That didnt stop me from putting some bright colored ones on for some bling on the new shocks.