Thank you for posting with a link. What a super cool feature for a RV Resort/Campground.
For years we never had a dog, then when our kids were in grade school we got our first working dog as a pup, and we trained and loved that dog. My requirement was to be able to travel with a dog and most people wouldn't know we had a dog. And she was a perfect traveling dog, never barked, and would stay quietly in our campsite, regardless of other less well trained or behaved dogs walking by.
Now we have our 2nd dog after cancer claimed our first way to early. This one is a rescue, same breed, but a handful for sure. All the love and training in the world can't undo whatever happened in this dogs first 7 years. Our dog probably would not do well in a dog park because of his aggression issues, but I think off leash dog areas are fun for most dogs and owners.
And my brother in-law who is veterinarian with his well established practice likes dog parks too, they tend to be good for business. All the best, Hans