I own a 2007 f-150, and the bed jumps up and down, and left to right when i hit any bumps on the road. It only has 30k miles, and the movement of the bed is severly evident. All of the bolts are tight, but it seems like something might be broken, as in a weld. Please help me with this question if anyone has experienced this problem as well.

 

HAve you checked your ubolts?