Front - 20x8.5, 5.25" Backspacing, 245/40 Nitto Invo
Rear - 20x10, 5.5" Backspacing. 315/35 Nitto Invo
Drop is supposed to be 5/5 from Pro Performance (Pro3 kit), but it feels like the rear is a little lower than that.
315 is a lot of tire for a 10" wheel. I think a 305 or 295 would fit better, but I wanted as much tire as possible. I wanted to try to fit a 275 up front but one of the tires got lost during shipping, and the only thing available before winter came was those 245s. The truck has a bit of a push through corners, that I think would be fixed by more tire in the front.