Winterizing tips for living in RV, in frigid climate?

I see you are planning on not using the hot water tank????
Are you going to drain it, because the tank is insulated to the inside of the coach and will freeze even with heat on inside if the tank is not running to keep the water hot. (Experience taught me this one)

Does your unit have a heated basement where the tanks are??

If not you will have to skirt and insulate and have heat underneath to keep tanks and pipes from freezing also.

Good luck