i need a recomendation on tire size and brand for a 2012 laramie 1500. i would have to get them replaced before i bring this new rig home. i need the largest or best size for the stock 20" wheels. i would like a rough tread pattern for farming type duties. Nitto, bfg, firestone???? Mainly need to get the best tire sizes i could use for this truck. thanks!