I noticed that Joanne's Awesome Wiring Diagram calls for 12VDC only. There are other diagrams later on in that thread which bring a converter into the picture to convert shore power over to 12VDC and I get the feeling that most of the setups are based this way.
I really like the idea of also using an inverter to have limited use of some appliances when shore power isn't available, which has me thinking about the way I'm going to go with my electrical layout.