[inghamm]

We camped on Vancouver Island December 2015 into January 2016. It got below freezing at night, and we did have condensation problems. Since then we

1. Used Damp Rid
2. Turned on the bathroom fan while showering and left it on until the bathroom is not steamy

In fall of 2016 we took a trip where we had several nights below freezing, although it would warm up during the day. We didn't have much condensation. We were connected to shore power and using electric heater(s) during the night /morning
Concerning heat - if you have shore power, consider getting a little electric heater. If not, I would think the propane heater would be much safer than a woodstove.