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We have spent several winter weeks in our 06 3000rk with temps never getting above 32. Never had a problem. I'd set the thermostat at 55 and head for Tenn. You will burn a little propane but won't have the issues of de-winterizing when you head for Fla. If your son is there he can ckeck on the unit a couple of times a day to insure the furnace is running.
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2006 3000RK
2009 Ram 2500
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