You can install our site as a web app on your iOS device by utilizing the Add to Home Screen feature in Safari. Please see this thread for more details on this.
Note: This feature may not be available in some browsers.
This leaves one question open: because authorized drivers are covered by the Roadside Assistance program, how can they request it if the main account owner is not in the car with them? This seems to be a miss (intentional?) from the Tesla App.