I agree about RV Park Reviews, by the way, as a good source of campground info. You can also use the AllStays camping app.
Besides commercial RV parks or national and state park campgrounds, you may want to try camping on public lands - National Forest Service, Army Corps of Engineers, etc have some beautiful places, many with water and electricity. They have a mandate to include recreational facilities for projects like dams, etc. There typically will be a sanitary dump station for emptying your black and gray water holding tanks.
Another good app for RVing is Gas Buddy for finding the lowest price fuel on the road ahead.
