Unfortunately he doesn't know what his backspace is. He told them what he had when he ordered them and they seemed to fit just fine when he put them on. From what he says when he hits big bumps, dips, etc, the tires actually get cut by the fender lip.
I'm going to send him a link to this thread and let him get involved. I would really like to run 40 series 22's. Maybe between all of us we can figure out the right combination.
In case you haven't seen my post in the photoshop forum, there was some conversation started concerning this as well-
Look here