I have a 06 f150 4wd with a 2.5" leveling kit, currently on my stock wheels i have 315/70/17s (gen grabber at2) and they're rubbing my control arms at full lock. I'd like to get new wheels anyways (or i'd just get some wheel spacers) so was looking for the best offset for my setup...the sticky said 5-6" backspacing but I've read people with issues at 5.5" backspacing. Is there more to it? at 5-6" backspacing a calculator shows about a 6.35-31.75 offset does that translate correctly when I'm searching for wheels?