Me would think, the thing that would be best on the "worry" factor would be to winterize.
But, at least drain it all, water heater and all.
Your Montana will take short periods of freezing weather just fine, IF the furnace runs. But, that takes propane.
Ya have to do what ever it takes to keep you in the comfort zone, so you don't have to worry while you are away.
If you don't care about propane use, leave the furnace on about 50 degrees, leave the water in.
OR, drain the water and still leave the furance on about 45 degrees.
OR, winterize.
If you have other items in the unit that you don't want freezing, leave the furnace on 45 and cupboard doors open.
enjoy your trip back to TN and to FL.
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