Best Listing of RV Parks?

Lots of choices out there with some better than others. Good Sam's directory is not very thorough and poi built into gps devices are pretty basic. Google has okay information but again is pretty limited. Your better bet are the more actively used and maintained directories or apps. Rvparkreviews.com is great for reviews but is heavily biased toward, as the name suggests, rv parks. Allstays is an app, for your phone, with a good poi. We start our search at a newer search engine that is very good Campgroundviews.com . They include a ton of pictures and short 30 second videos that allow you to see the parks. Recreation.gov is great if you are looking for federal sites.

Finally there is this forum. Post a question and in about 10 minutes you'll get some good answers.