Peter, you will need to give us more information, like is this home base going to be traveling about, or plugged in at a fixed stationary spot? If stationary and connected to power, I would recommend heating with an electric heater or two, and keep the storage doors open to allow the heat to keep the water system from freezing and to allow the heat to get into the storage areas. I would also use reflextic insulation panels in the windows
and some up in the roof vents. If you will be moving around frequently and needing to use the propane
to heat , you should get another tank, as you will be going through them in about 3 days, but your battery
will need recharging every day.
Dave & Paula