[Stripit]

I don't think your going to get any more life out of the tires with them suspended off the ground. RV tires normaly time out before you wear them out, such as 3-4 or 5 years of life, then replace. As for lifting I carried a 6 ton bottle jack that I could place on the spring purch plate that would lift the tire on one side off the ground. If I was working under the trailer and had the wheel off I used a jack stand under the frame rail as a support just in case.