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.
It is easy to do now, but the host serving the web page would need to know your TM username and password. I'm doing it now, but only for my own car! I have a webpage that will show all of the charging stations within 50 miles of where I currently am, for example.