I would recommend holding off. Spending any money on nearly bald tires is a waste. I would look for newer tire take offs from wheel/car dealers if you must go used route. Also, in my area the 29lb tundra 18" wheels sell for next to nothing, so i'd be looking for those if wanting to go down in size on the cheap. There are 3 sets within 150 miles of me for $100 or less.