Hi new to forum but I had question about switching my batteries. We have a 1995 Winnebago Vectra pusher that has 3 batteries 2 for the house and one for the main engine, they are all 12v but my issue is the house batteries only last 3-4 years and I was wondering if I would be better off wiring 2 6v batteries together to make 12v for the house and leave the main battery a single 12v. I have heard that the 6v batteries are made with heavier plates and together would have more amps than the 2 12v together. I would appreciate any help thanks Newbies