I had a 2001 Sport Trac before the Titan and the bed of the truck never shook or made noises going over bumps. I recently took my Titan into service and explained that the bed of the truck has excessive movement and makes a clanging noise when I go over bumps. The service guy said he torqued all the bolts and checked the bumpers that cushion the bed and everything is working properly. It looks and sounds really cheap going down the road. I love the truck, but it seems to me that the bed should not be doing this. Can someone help out with this topic? Thanks for your time.