Newbie needs help picking the best battery for Lance TC.

I was able to shoe-horn 2 6V AGM golf cart sizes batteries into the cabinet under the front dinette seat. That gives me 220Ah of capacity. In that space they have to be AGM since there is little ventilation. I use my former battery box to store the power cord and related accessories.

Do NOT use a true Gel battery, your converter will boil it. They require much lower charge voltages. They are also not easy to find anymore, I think. Most power devices like wheelchairs now use AGM batteries.