>>propane heater was very noisy
They all are. But like living next to a railroad track ... after awhile, you won't notice the trains.
We prefer using a electric ceramic heater when we have power.
While dry camping
, we heat up the trailer BEFORE we go to bed, then turn the thermostat way, way down if not off completely ... preferring to snuggle together under mounds of blankets.
If we do turn off the furnace
, in the winter, when dry camping
, if and when we wake up cold in the middle of the night, we run it a few cycles before crawling back under the covers to catch a few more hours of sleep.
Burning gas while we sleep makes me nervous in both my home and trailer ... and we try to dial the thermostat as low as humanly possible when we sleep.
We also usually "crack" the bathroom window and the top vent in the trailer, while sleeping, even if we're not running the furnace
But, as I said, you get used to the noise.