Steve and Jean,
We have camped several times when the temp was in the teens without any problems. Normally, we do not use any heater at night, our personal preferance, but you may need heat at night. So, I suggest that you have at least two fully charged batteries well charged and a thermostat set at about 50 degrees while sleeping. In the morning, flipping the thermostat to a livable temperature only takes a few minutes to get the Monty up to temp ...this method should get you through your weekend.
Having some heat in the livable space will keep the tanks from freezing. Don't use any of your hoses (including sewer) until the warmer part of the day. When cold, we don't use any faucets, we use the water stored in the fresh water holding tank. Keep all of your tank valves closed until dumping....you should be just fine.
Happy camping!
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