12v 30A auto breaker behind electric panel?

Does anyone know what this is for?  The main 12v power comes into the pod to an auto reset breaker before going into the main panel off of the same post..  The auxiliary post off this breaker looks like it has a 10 gauge wire coming off of it.  Does anyone know where this wire off the auxiliary post goes to?  I can't track it down.  The breaker is Type 2 instead of type 1 which is very uncommon for this type of breaker.s

I just looked at mine which is stilled mounted under the trailer. The wires mounted to it are the big wire from the trailer battery, the 10 gauge wire from the from the 7-pole plug connector to the tow vehicle battery and a smaller wire that connects to the breakaway switch. I am not a fan of automatic reset circuit breaker so I jumpered around mine and replaced it with a circuit breaker I mounted to my battery box, that can also be used a battery cutoff switch.