The safe advice is to tell you to replace everything from your alternator, batteries, battery boxes, cabling and your charger/inverter with the most expensive stuff West Marine will sell you. No discount allowed, full price only is acceptable.
Myself, I'd just pull the two questionable batteries and see if I could live without them. If not head to Costco/Sam's Club and grab two off the shelf.
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Craig
It's easier to fool people than to convince them that they've been fooled - Mark Twain
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