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The 360 to 440 amp hours ( stated in an earlier response) from two six volt batteries is much higher than I've seen before. Unless they are really big batteries I don't think you will get that many amp hours from a pair of 6 volt batteries. Paralleling two 12 volt batteries is a pretty standard technique.I read recently in a boating magazine that if you parallel two batteries they should be wired such that one polarity connects first to battery A and battery A is jumpered to battery B. The other polarity connects first to Battery B which is then jumpered to battery A. That method balances out any subtle difference between the two batteries. If you expect to put a pretty heavy load on the system it would make sense to wire it that way.
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