If you do little to no dry camping the question is why would you have dual 6 volt batteries in the first place when a single G24 12 vdc battery would serve your purposes just fine? For basic needs like this even a Costco branded G24 would be fine.
The trailer came with 2-6volt. I don't understand what the G24, G27, G29 numbers mean. I'll do some research.
I thought 2X 6 volt is better than 1X 12 volt. We had 2X 6V on the tent trailer, but now we've got the travel trailer. I'm still new to what is good/better/best.