If your doing the work yourself, there are a couple of ways to support the coach - depending on what your doing.
1) If you need room to get under coach to drain oil for example, you could drive up onto some blocks (stacked blocks tapered like a ramp, but wide and long enough to fully support the tire width contact patch. Like 2"x12"s stacked where the bottom board is 24 inches long, the next board screwed to it is 18", then 14", 10", etc.). You would also cut a 45 on the board edge to make it more ramp like).
2) Jack up the coach (i.e. Hyd. Bottle Jack) under the axles and put jack stands on each side of axle for support (never trust the jack alone). Be sure to chock the front wheels if you lift the rear wheel off the ground.