I've had no trouble with my diesel fuel in the winter. I agree with keeping the tank close to full. Diesel is very stable over time, even in cold weather. Your generator will be fine but it's best to run it with a load for 45 minutes or so once a month. You need to be sure the gennie radiator coolant fluid is winter rated also. You need to winterize the house water system like any RV in the winter either by antifreeze safe for water systems or blow out with air.
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