I've camped in Texas all my life, year-round. I've woken up with ice crystals forming on my sleeping bag. As long as you have the proper gear, and you stay dry, you should be fine. Also remember not to scrape ice off any fabric components, the ice will take any surface treatments with it.
But I'm curious, why not run the furnace?
Our tech told us during our PDI that the furnace would eat the propane in a hurry, but I ran it for a couple hours straight the other day to get the stink out (new unit) and it did just fine. But then my neighbor's opinion is "why waste the propane at all? If you're hooked up to shore power, just use an electric space heater." You don't need much of one to just take the chill off that small amount of space. In fact, if you recall here in Texas about a month ago, we had that first cold snap where it got down in the 30's at night, and we used a tiny space heater just to remove a little chill from the rig in the morning; worked beautifully. But for more than that, we would use both the furnace and the little space heater in conjunction.
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-2018 Greyhawk 29MV
-2020 Jeep Wrangler Unlimited (JLU) (Primary Toad)
-1994 Jeep Wrangler YJ (Secondary Toad)
-2014 Jay Flight 28BHBE & Ram 2500 6.4L CC 4x4 (sold)
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