I have an 04 fx4 and i've noticed when i hit a bump the left rear corner bounces as if it's loose. i've tried tighting the bolts in the bed but they are tight?????? help

 

It's normal for the F150.

 

When ever I drive down one of the streets on my way to work the bed looks like it's going to fall off. Don't worry, it's completely fine. Though that road I drive on is practically an ATV course made from 50+ year old asphalt.

 

Normal. It's a byproduct of having such a stiff frame.

 

well it seems to be normal, nut if it really bothers u just weld the bed to the frame to be sure(you will have fun getting it off though)