Just picked up a used 2015 F150. Whenever i go over a bump or pull into my drive way and the truck rocks left to right I can hear what sounds like something rolling around in the bed of the truck. But nothings back there. I checked the spare tire and it seems tight. Just wanted to ask to see if anyone else has had this issue.

 

Check the chassis cross member underneath could have a rock in there.

 

Never thought of that, thanks man

 

After the dealer having the truck 3 days last week, the noise is worse now. They said they check everything and that they are clue less to what could be making this noise. Wonder is it would be the bed flexing and popping.