Another thing to consider is all WiFi sessions are two way conversations. You can see how large the park’s antennas are, now compare that to the antenna on your device. Same goes for the transmitter sending out the WiFi signal. The park’s is hard wired and usually set up high to o provide the clearest lines of sight. Yours is likely blocked by the RV walls and furnishing any being powered by a small battery. It is often the case your device can clearly see the WiFi signal but the park,s receiver loses contact.