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With no waste or fresh water in the tanks I would just keep a ceramic heater centrally located, say on the kitchen counter and set it on low to keep it above freezing. It takes quite some time even in the teens to freeze things. The warmth of the day takes a while to were off.
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2018 Chevy 3500 LTZ Dually Diesel 4x4 CCLB
2011 Montana 3455 SA. 6 point level up. Disc brakes. Curt Q24 Hitch. 5 step glow steps
Progressive EMS. Valterra tank valves. Sailun G637 tires. ARP fridge control. All led lighting. Mor Ryde IS
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