I have a 2003 Ford F150 4X4. It has stock suspension, but the front torsion bars have been tightened a bit to level the truck out. It has dinky little 245-75-16 tires that are getting pretty old. Im frequently off road, and would like to get bigger tires under it. A small lift is an option too, but nothing too aggressive or expensive. WHat tires fit under a stock f150? How about a 2" lift? Any tire size suggestions?