As others have indicated, RV park WIFI is not considered optimal for people that require reliable internet access for work related activities. If you happen to have reliable WIFI at a RV park, consider it a bonus.
I would suggest you take a look at the Mobile Internet Resource Center. They have a free section which discusses options for people requiring internet connectivity while on the road.
Their general consensus is along the line of; 'if you need reliable internet connectivity, you will most likely find that cellular service offers the most reliable & affordable option'.
I have been working from my RV since I went 'full time' in December, 2019. During the next several months I tried a variety of products to improve the internet reliability of 'phone' cellular connectivity & RV park WIFI. I ultimately settled on an enterprise/commercial grade cellular modem/router from Peplink with multiple cellular carriers. There are others who have acquired similar equipment with the associated 'data only' cellular plans & there are those who have gone with other solutions. There are almost as many opinions as there are people.
It works great, but, the reality is this................. if bandwidth isn't there, you won't have internet on either cellular or WIFI. The site provided by Mapnerd is probably as good as it is for the time being devoted to availability, but, it's cellular coverage.
Good luck & safe travels.