I no longer store the RV for the winter, but when I store it between uses, I disconnect the coach batteries and connect them to a battery maintainer. I do not disconnect the engine battery, but leave it on a battery maintainer. If you cannot use battery maintainers, you need to disconnect all batteries for long term storage. When I used to store my RV in the winter I didn't like starting the engine or the generator during storage. I think the strain of starting a dead cold engine is harmful, and I don't think that idling for long periods of time in cold weather is good for an engine.
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