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You could use the 80 amp, but I would suggest you put the main panel on the same side as the batt, that is from the converter and powers the entire 12v system in the trailer, each circuit from there has it's own 15 amp fuse in the main panel. It should also provide the reverse polarity fuse protection in the converter.
I would move the one jumper wire as I suggested and you will be fine, if you were having no problem before then you won't now, adding the second battery just caused you to put one wire on the wrong post.
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