[Modges'66]

Chris, my wheel is 11.5" wide which makes it 12.5" wide across the outside, and my tubs are 13.5 wide across the inside...Add to this the fact that my rear-end is all fresh and I didn't want to re-address it, or the costs of buying new axles...again!
My wheels are spaced to be within the INNER box side and the tub...
I didn't want the possibility of the return lip on the tub to ever come in contact with the tire, and I am running stock bed height/tub configuration (except for width).
I decided that is was a better choice to pay a little extra to buy a custom offset wheel to get the width & backspacing that I needed than to narrow the rear-end, and Travis at Pro-Performance really pulled this off for me!
Either way, the placement of the wheel was critical!