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On our 2010 we camped for weeks in that type of temps without a problem other than having to make a lot of trips for propane. Never used anything but the furnace and nothing ever froze. Kept the valves closed except to dump. Enjoy your trip, run the furnace and don't worry about it.
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Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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