I have a Scamp 13' RV whose 12 volt battery has long since died. I'm looking to replace it, and I'm also looking to supplement charging with a surplus MX60 and a couple of 275 watt panels I have on hand. My question is what is the best battery for this application? I'm thinking 100Ah (since that's the spec I'm seeing when I Google "RV battery") but I don't know if that's the 20 hour rate, or what. I also would supplement charging with a small portable generator so I'm not worried about load vs battery capacity.

Note I'd prefer not lithium-based, thinking AGM. Battery case is sized for a group 27, I believe.

Any suggestions? Thanks in advance.