I was doing suspension work on Cosmos X this weekend and noticed his bed was not lining up with the cab. I had the same problem with my truck when I bought it. It is an easy fix though. All you need to do is loosen the 6 bed bolts with a T-55 torx bit and center the bed. Then tighten the bolts up and you are done. Maybe a 5 minute job. Here are some pics of before and after. His bed was pushed over to the drivers side.
BEFORE:
AFTER:
BEFORE:




AFTER:



