Do you have a spacer? To get correct offset on the 2015 wheel on the early truck, you need a 2" spacer. I run the 08-10 wheel with a 34" tire with just the fender liner pulled back and bumper spaced forward. Suspension is stock.
with the 12" wheel and -44, you will get very close (if not rub) the spring and the outside edge of tire in wheel well.