Speedfreek, the Super Swamper Tires 39.5x13.50-15LT, IROK Bias Ply is definitely a good tire to have in the rocks! It has a directional tread in a three stage lug design, scooped lugs, blade and molded siping, special sidewall features, and extra tough cord and cut resistant compounds. In that size the IROKs are the way to go!