I'd be tempted to use some of those Anderson PowerPole connectors from PEI, at least up at the panels...low resistance, high current, and convenient if something needs to be disassembled. The 50 amp connectors will handle #6 on up, and the 30 amp will take #12, and you can make a 'Y' pretty easily to pair up the panels. They also make it easy to put a dc meter in series.
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