I have a 2016 Georgetown, and my house batteries are on their way out. I currently have 4 house batteries. I am never off grid except for an occasional stop overnight at a rest area. When I am home, it is plugged in. Can I get away with only running on 2 house batteries, instead of 4. I do have a residential refrigerator running on an inverter when traveling. I see some people saying they have one battery. Are 4 actually necessary, or is it just overkill to have 4?