RBTS,
You will not find what you seek in the normal RV stock. What you want if a common marine item. Or, with a drill press and layout tools, roll your own. You will need separate AC and DC panels, I would suggest that you actually do three panels:
AC shore power
AC inverter power
DC
I did a lot of boat work before the depression, and I did several performance cruisers (retired racing sloops) this way and it was well received.
Advice: Run all the copper you can imagine now. If you think you might ever want another circuit there, but it in now. Copper is cheap when compared to labor.
Matt
