The majority of the wiring in the rig is smaller gauge. Some have 14/2 w/grd and some have 12/2 w/grd. Protecting this wire with a 30 amp circuit breaker is asking for trouble.
In theory you culd add an additional subpanel powered by the 30 amp breaker. In the panel you would install the correct sized circuit breakers to protect the wire, IE 15 amp for #14 wire, 20 amp for #12 wire.
You will still not be protecting some of the items like an inverter(if equipped) or the converter. These items should be left in the factory panel.