I always take mine out of the camper and store it in the basement during the winter. I would think the only way to winterize it would be to pour antifreeze in the water compartment and run it through a couple of cycles. I don't have any idea how long it would take to flush it out the next time you wanted to use it. IMO, the best move is remove it for the winter.
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2017 Ford F350 1-ton Dually Diesel
2020 North Point 315 RLTS
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