We have 3 battery set ups on board our rig. The car battery (we all have that!) the back of house batteries and now the Aux batteries under our hood. Our Aux batteries will charge all our exterior components, the KC lighting setup, Roambuilt winch bumper, also a few extra outlets in the front of the cab and future air compressor.
We have two Fullriver DC224-6 mounted in the Adventure Wagon Battery Tray set up in series for a combined 12 volts.
You can pick up this setup as a DIY kit from Adventure Wagon which makes life really easy! Grab your tray here and check out their install video below: