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Hi Bob, the jump box would not be a good solution, and I would suggest getting deep cycle batteries, starting batteries are not designed for charging and dis-charging, RV batteries should be deep cycle. You would be better served with them. I also suggest two 6 volt Trojan 240 AH batteries for your trailer.
In your instance, I would remove the batteries for the storage period and take them home.
Good luck with your battery problem, and welcome to the Forum.
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