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Like it was said, a fully charged battery will not freeze.
Fully charge the batteries then disconnect the negative side, that will remove all the parasitic drains. After storage all will be good.
There are some risks to leaving an rv plugged in.
- Charger could over charge the battery, this will depend upon the type of charger, some have happy maintain modes and some don't.
- Fire, having the rv's system energized could result in fire, mouse chewing, equipment failure, etc.
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