I used 2 walmart group 27 deep cycle batteries in my trailer. not impressed. my theory for walmart is they are everywhere we travel if I need a replacement, but the problem is we keep needing replacements... apparently poor theory. And they don't have a warranty on the deep cycles they sell now, mine had 36 months. Don't know if that is because of the deep cycles, or because of walmart. I'm betting on walmart.
The RV guys all seem to say that 6v golf carts in series to make 12v is the way to go, but that would only work with 2 or 4 and you have 3. But 2 of those may have more capacity than your current 3.
We don't run on battery much, but all the lighting is 12 volt, and the charger runs constantly when plugged in or on generator during the day when we are on the road.
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