From my experience, I can add:
All EAA camping (Camp Scholler, North and Homebuilt camping) is paid from arrival date through the end of the show with a 3 day minimum. You have to specifically request a refund for unused days over the 3 day minimum before you leave.
The so-called RV camping area is really called the Homebuilt Camping Area, for all homebuilts. It's within the grounds, so it's very convenient, near the forums area. That also means that when you pay for camping, you also must buy wristbands (because you are already within the grounds) for the days you'll be there. That's a lot of coin upfront if you arrive on the first day of the event.
The aircraft parking area north of Runway 27 and, I think, the aircraft parking south of the approach end of Runway 36 have no parking fees. That also means there are also no camping fees, but also no facilities.
Airventure Notam, don't leave home without it.
If you land on Runway 27, make a right turn off and plan to go to Homebuilt Camping, you will have the most punishing off-pavement taxi you can imagine nearly 2 miles long before you get back to a paved taxiway. Ask me how I know.
Before flying in, I called EAA and specifically asked if I would be able to get in with my RV. I was told that they haven't maxed out parking for homebuilts or showplanes in any year, yet, so come on in.
Last year, I flew in on Wednesday during the show just before noon. There weren't more than 1 or 2 planes in the arrival sequence.
I've also driven to the show in the past. In some ways, it's nice to be able to get away from the hubbub at the airport and go elsewhere in town or over to the seaplane base at your leisure.
It's always struck that with all the action at the airport, once you get 3 or 4 miles away from it you'd be hard-pressed to even know something so big was going on nearby.
It's the highlight of my aviation year. I'm going again this year.
