i was driving 55 on the highway, hit a small bump. The truck started to bounce wildly. So bad in fact, the rear tires bounced off the ground and i blew out a rear shock. I still can't believe I got the truck back under control. This problem has happened probably a dozen times since (never as extreme as the first time) over the years but at least now I know how to deal with it. SLOW DOWN AS QUICKLY AS POSSIBLE.