Keep your wheels but get BFG All Terrains in 31x10.5R15LT. You will love the tires, they look tuff and are much tougher than they look and they wear very well with lots of highway miles. They air down and flex well off road too and the 7in. rim will be well protected also. You cannot go wrong with this combo. I have had 5 Toyota 4x's and have always run this combination although the size has varied. You will also notice no real decrease in mileage or loss of power.