2 6v batters VS 2 12v

Cocky_Camper wrote:
I just replaced the house batteries in our Sea Breeze after getting 8 years out of them. It had to 6v in it. Just curious, why do some people run two 6 volts instead of parallel 12v?

Keep in mind that two 6's in series, is just one big 12 and granted, it's big, but then if you only have room for four batteries, you now have just two big 12's, rather than four smaller 12's.
Usually and unless you find some really large 12's that will fit, the four 6's will still have more capacity.
They they found this out, with putting four 12's in golf carts for awhile and have since went back to using six 8's, so again, pure deep cycle comes in multiple voltages.
Then we have the AGM's and my preference and even though expensive, they're maintenance free and don't expel gas. Also the ones that I have, came with a 60 month, replacement warranty, so we'll see how that goes, in a couple of more years.
Mine are four 12v AGM's, neatly connected in parallel obviously and the main reason for going this route, was for keeping it OEM, like the connection diagram on the compartment door and not like we boon dock for days on end, anyway. No matter what, you'll need to run your genset occasionally to keep them up, anyway.