One step would be to drain all water lines and tanks.
Add about 2 cups of 50/50 solution of automotive anti-freeze to all sink traps. Don't forget the bathroom sink and shower, too!!
If you are in heavy snow country, you may want to put a 4x4 post between the inside roof and the floor to help support the roof framework.
Get canvas covers for the A/C units and disconnect/remove the batteries if they are outside on the tongue. Chock the wheels if on even the slightest incline to prevent the unit from sliding on ice.
DON'T FOLLOW THE ADVICE ABOVE. Automotive anti-freeze is extremely toxic. There is an RV anti-freeze that made specially for this purpose. It is not toxic and completely safe.
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