Did you ask Airstream to turn off the Campground Wifi portion of the Connect system? That will get it go faster. Best improvement for speed is to add a separate WiFi router to the connect, something like the TP Link Wi-Fi 6 router that is discussed in other Airstream Connect threads. That will get you speeds generally faster than what you see on your phone since you have dual MiMo antennas on the roof with the Airstream Connect.
2020 Classic 33 Twin, 2019 Ram 3500 Longhorn, ProPride