I think they would work very well. I think Zane runs them on his truck. 12 inches is plenty wide for a 4x4. The only issue I would have with them is thier not DOTs or at least i don't think they are. So they can't be used in a super street or street legal class.
yeah im pretty sure they arent. i wish there was a cheater slick or somethin DOT approved that was taller than 30inches and not freakin 17inches wide or somethin. i would run them all the time. i dont drive the truck much