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.
I installed the P2 in the European version of the Model X and there is no difference with the NA Model X regarding the instructions.
The only difference is the connection to the trailer which is a 13 pin Jaeger plug. The controller signal goes on pin 12.