Truck battery isolater built into 05 Arctic Fox camper?

Be careful what you wish for. For my old T C set up I added a relay to stop power to the TC when ever the eng was off. I soon found that this was a disadvantage because I would rather use both the truck and TC battery at the same time for the first evening, then isolate the TC the next day. This way I cut down on the depletion of the TC battery during the first evening and only minimally discharged the trucks battery.