I have my phone setup with Tasker to ready my text messages allowed when connected to the MyLink Bluetooth. It does this even if I've not connected to the Android Auto.
I mainly use the Android Auto for the Google Maps navigation. The trucks navigation is years behind as far as updates to roads go. With the way Google keeps their maps updated, I don't know why anyone who has Android Auto or Apple CarPlay uses the factory nav or aftermarket window mounted nav.