[bsmith0404]

I've had 2- 12 volt batteries in mine since I bought it, I made the dealer install them as part of the deal. I've never had an issue, but we don't dry camp for more than a day or two at a time, usually just an overnight while traveling. If you run 12 volt, you have to run them parallel to maintain 12 volts. That doubles the amp hours. If you run 6 volt, you have to run in a series to get the 12 volts required for the systems. Running parallel, give the same voltage, but doubles amp hours. Running in a series double the voltage, but does not double amp hours. The advantage of 6 volt batteries in a series is that 6 volt batteries typically will have more amp hours than 12 volt batteries parallel. If you do a lot of dry camping, 6 volts are probably the best way to go, if not, 12 volts are fine.