i've run bfg a/t and bfg a/t ko and i will never look back. i love them. never been stuck, tread cleans really easy, they run GREAT at 10-15psi offroad.
so far i have gotten the set of 31x10.5 that i used to run for free, and i also got the 33x10.5 i currently run, for free. if you go above a 31" tire, i would recommend you go bigger than a 15" rim, less rubber to turn, which in turn helps your fuel and power economy.
one tire i STRONGLY recommend NOONE EVER use, Yokohama Geolander AT/S. i had them before my bfgs, spent 900 on the set new, and they only lasted a year! they had NO grip in snow or ice, forget about touching mud, and they have a fairly THIN sidewall. all of this is coming from experience. i would use them as my highway tire to get to the offroad meets, then put my bfg's on when i got there. they are only good for dry to moderately rainy pavement. and barely at that.