Gosh Pete, that is pretty far north and you guys get some major low temps that far up. It would probably work, but I would want to check the heater pretty regularly.
Now, here in the South we get a few days/weeks of below freezing temps, but usually during the day the mean temps are in the 40's or 50's. We have never winterized any MH we own, but have pumped pink in the lines and drained WH in the travel trailer.
We keep a small heater in the MH turned down pretty low and the doors to the bath room, cabinets and shower open. Light bulbs in the wet bays. That works here, but upstate NY ????