I have off brand mudders, Mud Kings, they work great but they are really soft and are half worn out after like 10,000 miles. Discount has really good prices. CostCo doesn't stock Mud Terrains but they said they can get them. I might go with 8-9" wheels, you will be less likely to pop a bead or gash a side wall. I have 33x12.50s on 16.5x8s. I am going to get 16s eventually but the 8s fit the 12.50s very well.