Given the length of your trip, and how you don't always plan on being at a powered campground....
You may want a small generator
. Before anyone starts throwing rocks at me please note that I only mean this for when you are parked AWAY from everyone else. Do NOT run any generator
all night near others. No matter how quiet.
That said, this is my all time favorite little generator
. It even runs my AC, it's cheap, light
, small, pure sine wave so it's safe for computers and electronics, and it seals vapor tight so there is no smell even when you take it indoors.
Oh and I forgot to mention (edit!) It's QUIET! Nearly Honda or Yamaha quiet.
I LOVE this thing.
Here is a picture of mine sitting in my Scamp's sink. It's a small generator that only weighs about 23lbs. Yes, I installed a fairly large sink, but still.
If you plan on parking out in the middle of nowhere and boon docking a lot, this might be your best bet. You could then run the water heaters and all on the c-paps and still wake up with fully charged batteries.
IG800w (all models of this are the same thing, different labels slapped on.)
Look for a price of about $250 to $280. It fluctuates.
The Dirty Hand Tools brand just popped up with these. They beat me to importing the 1200w and 2000w versions! I love these so much I intend to brand them and sell them myself. They appear to have the best price on the 3,200 watt version if you need a generator with some major kick to it. It's even got remote keychain electric start.