This area under one of the seats had a small,nasty fresh water tank bolted to the side. We added 16 Gallon fresh and grey water tanks with level indication under the sink, a battery, battery charger, true sign-wave inverter. The battery, inverter, and charger can easily be removed for other camping and I took them all to Burning Man last year.
The AC system will automatically switch from the inverter to the shore power, which can be plugged in on either side. The DC voltage can be sent to the new console in the bridge to supply clock power to the radio and or power the stereo when we’re camping.