Is it safe to assume that pretty much all RV campgrounds, both public and private, offer free WiFi. Obviously, we wouldn't expect WiFi in primitive areas. WiFi is important to us as it is our prim...
The best I've seen was at Inks Lake which was a good reliable connection in most parts of the RV campground.
I've used WiFi at several others. However, TSP WiFi is run through a gateway in Austin that filters out many sites/ types of data. It will not allow streaming video, it will not allow 'adult' sites, it will not allow large data downloads.