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3. The saving weight / additional amps is a myth...
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A couple of boats ago, I had an 8D battery for the house bank. It was rated around 225 amps. It was a bugger to move. A couple of golf cart batteries would have had around the same amp hour rating and while their overall weight might have been about the same, it's a little easier to lift two smaller batteries over one big one. I think that's where the weight/ease of handling comes in.
Our current boat has six 2 volt batteries for the house bank. It was a larger investment up front over golf cart batteries, but when you do the math with amp hours and number of cycles the $/amp was considerably less. We expect to get 15 years our of them before replacement at which time we'll re-evaluate whether that was the way to go or not.