You can't go wrong with a Super Swamper TSL. It's a classic and it will do whatever you want it to do. That said, I would go for the wider sizes. If I had a choice, I would run the 38.5x14.5 TSL/SX on a 10" wide wheel. If you run 12.5" wide tires, I'd use a 8 or 8.5" wide wheel.