[MrE]

My coach was previously owned by a gentleman from Minnesota and he installed a Proheat diesel boiler. Hooks into the cooling system of the coach which is used for the water heater, bedroom heater and front coach heater. Has a thermostat that turns it on at 150 degrees and off at 185 degrees. Not sure how efficient it is compared to other power sources with the current price of diesel, but might be worth looking into. I would also suggest that you block the wind from going under your coach, have seen this done with hay bales and foam insulation. Not pretty and would make it a chore to move your coach, but will keep stuff from freezing.