You're prolly right about 38's. I have 35" tires on my truck with only a 2" leveling kit and mudflaps and no rubbing.
Joe a.k.a "CSIPSD" a.k.a "Guage Whore" has a 4" Revtek lift and sports 37" Toyo MT's. A dang fast and good lookin' truck.
i'm not sure how you guys do it, but i've got a 6" lift and i had to trim the front bumper for my 35"s.... i know guys with the 8" lift, and they rub with
the 37's