Hi Folks, I'm a fifth wheel newbie. Recently acquired an 02 Nuwa Snowbird. I am a long time truck camper guy. The snowbird has room for 2 batteries, but came with only one. It is an Everstart 92...
Here is thought for the occasional dry camper. Install a marine battery switch. Get one that gives the options of bank #1, bank #2, both banks together or OFF.
Install cable for bank #2 so that it is easy to connect & disconnect. That way when you need it, bring the extra battery & connect it up. No need to have tray space for it.