I'm not positive, but I would think if you keep the inside reasonably warm (62-68) you shouldn't have too much to worry about. The lines are in the walls of the RV, so shielded from direct exposure. However, you may want to look to your Fresh water line and either disconnect and use the tank, or plan on waiting for the thaw to happen the next morning. Pretty sure the tank wont have an issue, too much water to freeze and pump should be inside the RV (at least mine is).
As for the propane, my 29M doesn't use that much for heating, but it depends on how warm you want the living space to stay. Jackets/Sweaters are easy to put on, then sleeping cool is pretty common. Also, depending on how many people are in the RV, the inside temp will reflect their heat gain also.
I would put 1/3 - 2/3 water in the FW tank and plan on using it overnight, disconnect and drain the FW hose (so you can use it the next day) and enjoy the cold evenings.
Just my 2 cents. Look for more info from the more experienced guys.
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Recie Tyson
2016 Thor Hurricane 29M
Lancaster, CA
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