You have TWO (2) electrical systems in your camper.
ONE is the 120V AC System......
Air Conditioner, Microwave, Fridge 'electric heat element', water heater 'electric heat element' and those OUTLETS work off 120V AC Power
Power comes from Shore Power when you plug your cord into power pedestal OR from generator.
Generator power gets to the AC Power Panel where the circuit breakers are either via a 'transfer switch' OR by plugging shore power cord into GEN OUTLET.
Other electrical.....12V DC System
Water pump, fridge controls/propane, water heater controls/propane, lighting.
Camper batteries supply the 12V DC SYSTEM when you no NOT have 120V AC power.
120V AC Power supplies CONVERTER which will power the 12V DC System and charge batteries in camper when you have AC Power/Generator
Truck can charge camper batteries via camper to truck cord when truck is being driven (provided you have truck 'tow/trailer' relay/fuses and 6 or 7 pin cord.
