Also, as far as power goes. Use 12v lights, fans and such. Grab a 110v to 12v converter out of a junk trailer, or source one out new. That way your basic needs, light and ventilation can be simply switched over easily. I say this plan over simply getting a 12v to 110v power inverter, because it'll be harder on the car batteries and the inverter to power everything. What if you have a cloudy day, and you're using a solar charger, and the batteries don't get a full recharge? You'll need to run the vehicle to power everything. This wastes gas, and makes noise. Both of which will be very important as a BO/PAW/Camping experience. Also, very important
, do not attempt to run a 12v to 110v inverter on a partially discharged battery. You will ruin the inverter.
Wire your plug-in receptacles for 110v. That way you can limit the power draw, and only use these accessories when needed. Think of "power vampires"
in you home. Electronics that still draw a low voltage, while waiting to be turned on. These can add up, and stress an already fragile system.