[netjam]

I think it depends on the kind of rving you do. I had 2 6volts in my Elite Suite. The original Interstates gave up in the first 6 months but the Trojans I replaced them with lasted 4 years til I sold it. My current Escalade has 1 really cheap no name 12 volt. I never boondock, so really no difference that I can see. Might be different if I wasn't always plugged in. The difference to me will be in replacement cost...1 12v will be cheaper than 2 X 6v.