Okay so I need to know what kind of backspacing to go for with

33 12.50 tires
15x10 inch rims
And 2.5 inches of lift from add a leaf and BJS

 

With your suspension and tire size, the ideal rim size would be 15"x8" with a 3.75" backspacing. With a 10" wide rim, I would think 4.75" would be the correct backspacing. I have a 4" backspacing on my 15x10 rims and my 32" tires rub a bit.

 

Okay thanks. I may end up trimming and pounding the pinch welds to give me a little more room