You might try loosening those mounting bolts, and see if you can shift it around to suit you. You will need a few friends to help do this, but it ain't hard.

Do lots of measuring from the same points on both sides of the truck.

 

Thanks everyone for the feedback, I really do appreciate it.

 

without measuring, mine is perfectly centered, but is a little smaller than the cab. wonder if this is airodynamics or just out of spec.

 

I can't believe these beds are out of spec. With all the advanced laser technology they can get tolerences incredibally close - if they want to. Even just building them on a jig, like they all do, wouldn't lead to what's being reported. Interesting topic. Wish there was some insight from someone with knowledge of how they are actually built.