What jack to have onboard for roadside tire changes?

I have used the rear leveler, with boards under it, to raise ONE side of the rear axle enough to change a tire. I set the brakes and blocked the front axle so the coach would not roll. Naturally after I had raised the rear axle I put a jack stand under the axle for safety. For the front axle, it is really easy to use the levelers to raise the front axle, insert a jack stand, and do what you need to do.