If you want to stay with your stock wheels and plan on going with BFG AT, I would not go any larger than 285. From my experience, and, from listening to reputable tire dealers, the sidewalls of these tires are weak (for lack of a better word) and tend to want to roll from side to side, which will bring on DW. However, I believe if you read most tire manufacturer requirements, they will all recommend a wider wheel for 33" and up.