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No idea what kind of trailer or what equipment it might have in it. No idea whether you have an "INVERTER" or a "CONVERTER" or both, (inverter for a residential refrigerator<with/without a charge capability> and converter for 12 volt power and house battery charging capability).
There "used to be" one battery and if you had a charger it had a single purpose... Today's RV's might a single "old fashioned battery system" or might have multiple battery systems to provide 12 VDC to the coach systems and another battery system to provide 120 VAC to a residential refrigerator...
Depending on what you have, the "switchology" of what to leave on, what to turn off, what circuit breakers to leave on and/or whether it's easier and more reliable to pull all the batteries, unplug the RV and store the batteries in the basement or garage for the winter.
More information about what trailer and what systems you have will help "zero in" on recommendations for winter storage.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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