Auto Reset circuit breakers are usually (Depending on where they hide them) easy to replace,m usually two screws (Mounting) and two terminals (Be careful with the wires)
Battery disconnect may say something like USE/Store, it is often remotely operated and just inside the door so you can "Connect" before entering.
CW likely installed a MARINE/deep cycle battery.. These are not my first choice
(DEEP CYCLE is needed).
But for now, use what you have,,, Replace with DEEP CYCLE when needed.
IF YOU DO NOT have a battery disconnect switch then there is an alternate way to disconnect.. NOTE: Do this when parked at the storage spot NOT at the campground.
Using a wrench (7/16" or 11MM is a common size, so is 1/2 inc) if needed, Disconnect the NEGATIVE battery cable.. just that one.
If it's a wing nut connection with more than one wire attached, Tie all th wires together with BLACK tape. NOTE; also put red tape, or split loom or paint on the wires hooked to the POSITIVE terminal, and tie all them together with string or something for when you eventually remove battery for replacement.
Why do this:
Red for positive black for negative enables you to reconenct properly
Tying all the wires together with tape or string means you don't miss one
