Last, and so far the only, time we camped in below freezing weather, we wrapped all the outside water drains in plastic bags or bubble wrap, and opened all the cupboard doors to heat the water pipes inside the trailer. In the morning I unwrapped the drains and opened each a bit to free them of what little ice had formed. There were no problems.
Since then I've also wrapped the inside water pipes (where I could get to them) with that foam pipe insulation. There are still a few places I couldn't get too and am still worried about. I've also gone around the trailer, especially underneath, looking for cracks and holes to fill with foam.
The propane furnace fan is really noisy. We purchased a very quiet and light-weight electric heater and prefer to use that.
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