If you're on Facebook, there is a group called "Fulltime Families" that is filled with families just like yours- either doing or thinking of going fulltime. It's a great resource.
The small fridge is surprisingly usable. I think ours is the 8 cubic foot size and we can typically get food for 3-4 days and often stretch to 5 for my family of 4 (where the 2 kids eat like small adults!).
We've been traveling full-time for 14 months.
Sewer hookups depend on the park- most parks that people decide to live stationary in have hookups at each campsite. You use sewer hoses or plumb into the sewer system. You'll let the black fluid (poops and pees) build up and them dump it when a tank under the camper is full.
Lots of campers have hard-doors for the bunkhouse. If your daughter is such a light sleeper, be aware that campers are generally poorly insulated and you can often hear what is going on outside. An air conditioner in the bunkhouse or some other kind of white noise machine will help.
2 air conditioners more from the perspective of size of camper and poor insulation. I have a looooong camper at 42' and would really prefer 3 of them.
Lots of storage solutions. Ikea is a FTF (fulltime family) favorite. We have been through a variety of ideas and implementations since launching. We still have too much stuff and are trying to find our way.