On my second cross country trip I decided not to tempt fate but to practice a tire change at home. I found I needed a few 2x8s under the bottle jack to fill in the distance between the ground and the frame. I also discovered my old 4-way spin wrench was really handy.
My second cross country was 6 weeks roaming from IN to western MT. I had a truck flat and a TT flat. The truck was a rock puncture the TT was a piece of metal. Fortunately both occurred where I could pull into a large parking lot for the tire change.
Naturally since I bought the TireAid ramp I have not had a flat but that is perfectly okay with me.
One other point, I torques the TT tire lug nut to the recommended 90 ft./lbs. but after a days travel they need to be snugged up a second time.