Ok, then. Since you'll be using it, I'd suggest the following:
If you want to be hooked up to the city water, you'll need to wrap the pipe & spigot (of not already done) & your hose with heat tape & then with insulation.
If not, you can hook up just long enough keep filling your fresh tank as needed.
Hook up a trouble light for both your wet bay & the bay where your water pump is. The heat from the light bulb will keep those compartments above freezing. The last thing you need are frozen dump valves or a frozen water pump.
Use your propane heat to keep the basement lines from freezing. You can extend the life of your propane by using portable space heaters inside your coach. Limit the use of your heat pumps, since they won't put out heat when it's very cold & they will not keep your basement pipes from freezing like the propane will.
If possible, have a larger, outdoor propane tank delivered & hooked up so you won't have to keep filling your smaller coach tank every few days.
Open blinds when it's sunny out to let radiant warmth in, but keep them closed if it's cloudy.
It may seem counter-productive, but keep a vent or window cracked just a tiny bit to let in fresh air & be sure to vent well after showers or cooking. It also helps with controlling moisture build up inside, typical during cold temperatures. Keeping the inside air moving will also help.
Try to keep the wind from circulating under your coach by putting a barrier skirting around the bottom. Some people use hay/straw bales, but I would discourage that because it can attract rodents. Get some kind of plastic panels or sheeting - anything to keep wind from blowing under there & sucking heat away. Once, on a really cold, windy camping trip, we actually pulled our slides in for a day, until the brutal winds stopped. There was just no way to keep the coach comfortable with those "ears" sticking out getting the force of the wind on them.
That's just a few things I know of to help you through the cold. More members will chime in with other thoughts.
Good luck & stay warm.