RE: Powering the 110v AC outlets from an inverter.
You are going to get (this is the first) a number of people telling you to
NOT do that.  Depending on how you wire it, and the switch, the first time
you plug into shore power BUT forgot to throw the switch, or someone else,
helping you set up, plugs in before you throw the switch, you could well
have some neat fireworks INSIDE the van.  Not worth the risk.  I have a 400
watt inverter permanently mounted, all by itself.  And I frequently plug
into shore power when it's available.  With the two sources stand alone, not
interconnected, I never have to worry.