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Starchmill, when we travel in subfreezing weather we set the thermostat at 45 (lowest setting) and leave the furnace turned on. We've never had a freezing problem while on the road and also have not noticed an inordinate use of propane from this procedure. You would want to make sure you have full propane tanks if you're that far north and check the regulator frequently and refill when one goes empty. We've not towed a lot with furnace running, probably not more than ten days but are satisfied with the results so far.
Keep in mind in trailers this big if you are using only propane for heat you can go through one of those 30lb tanks in as little as 3 days (from our experience). So, when parked we supplement with electric heat and also get a 100lb propane bottle from the park if they offer it and we'll be there long enough. The 30 pounder will go a week or more when using electric heat to supplement. We are currently connected to a 100 pounder we got on 10/20. It's about half full yet from what I can tell by the feel test. But we're not in much subfreezing weather yet, lows ranging from upper 20's to 50 and highs from upper 30's to sixties. And we're using electric heat, too.
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