With stock wheels, 37's (especially smaller 37's like BFG all terrains) fit pretty nicely and I didn't get any rubbing that way. I had 37's with stock tires on temporarily and had zero rubbing on daily street driving. Did some mild off-roading with no rubbing either.
I did just get the 37" KO2's on my Methods. They did rub a tiny bit on very sharp turns like u-turns. Went into SVC yesterday and they hammered the pinch welds and....BAM.....no more rubbing on street driving. I'll have to try out some off-roading. Obviously if I were to jump the truck and do hard core off-roading, I'd want fiberglass fenders. But for now, I'm very happy with the situation!
I would imagine stock wheels with hammered pinch welds would handle 37's very nicely!