We stayed at Mustang Run RV park near Oklahoma City. It has to be one of the nicest RV parks we ever stayed in. All the roads and sites are concrete. There is a pool and a dog run. The bathrooms are super nice and the rates for a full hookup campground were good. We stayed there 2 or 3 years ago and the price was $44 a night. The only downside is it's hard to find the entrance. It's located behind a hotel. But in my opinion,it's as nice as Ft Wilderness in Disney World but a lot cheaper.
http://www.mustangrunrvpark.com/