If you’re going to the hotspots in the winter, I can imagine you run into little vacancy. However, are you using Google? Because there will probably be more options than on the app. Just Google RV parks to find them in any area and then call to ask about vacancy. You’re bound to find one spot just for you! I can’t imagine many RV parks being savvy enough in the management area to be constantly updating an app or even know about it. The ones that do, are the ones that probably show up number one on Google and so fill up faster. And it doesn’t mean they’re better…
Best of luck!