I think baseboard heaters - especially with pets - would be a greater fire hazard than your Rv's furnace. LP usage will be your Achille's heel. Rv's are poorly insulated and exposed on all sides so the furnace will run a lot - despite an "arctic version". Without water, what will you do for showers, dishes, etc? Will you have hookups to dump the tanks? You are going to have to lug a lot jugs of water to continually flush your toilets and what will keep your grey and possibly black tanks from freezing? You may want to re-think your plan given your location. Your plan is easy if you live where I do. Northern MI - maybe not so much.