Rear axle centered to box wheel wells ?

I was at the dealer for the TSB flash and while there I asked about another problem
My drivers side front and rear sits 3/4 inches lower than my passengers side empty with 1/2 tank of gas. And my rear drivers tire sits inside the wheel well by 1/4 inch and the passenger tire sits outside the wheel well by 1/4 inch. I have read about the "Taco lean " and am not worried about that too much but the centering of the wheels is what bothers me .
The service manager and the tech measured 2 new 2016 on the lot which happened to both be the same TRD OR LB truck I have . They said they were off the same and even more than mine on both measurements. I did not and do not feel anything wrong while driving it . I would not even have known about it if not for putting on my sumo springs. I was checking it out to see what the difference was going to be before and after the spring install .
Anyone else have this problem ?

 

Interesting

 

Bed is probably misaligned with the frame. You or the dealer can loosen the 6 torx bolts in the bed and attempt to shift the bed over a bit.