"And if that 7,360 mile journey was primarily along major highways, you would only see the KOAs that were on those highways. "
It wasn't. Where ever possible I am a "two lane blacktop guy". We did have very good luck using Passport America, most were $15 to $20 a night with at least water/electric and a DS but many had full hook ups. They tended to be off the beaten path, usually very nice to gorgeous (streams, lakes, lots of trees etc.), with excellent amenities.
I never said that KOA's weren't nice. I object to their pricing, smallish sites, locations and the fact that they cater to and subsequently have a very high population (relative to other parks/cg's), of children.
:C