I found this product (Padbay) at www.padbay.net. and it’s awesome. Your normal 2 DIN radio remains installed, Padbay only sets mount the radio which keeps the ipad. it seems to be very well made and safe. Furthermore, there is an iOS app which I have already tested. The Padbay mount in combination with the app is just awesome, by the large buttons in the music player, the app can easily avail. The other features of the app are simply great. More info is available at www.padbay.net, the app can be found on the App Store.
There is also a Facebook Page.
This is a solution for those who want to have their iPad in the car
I hope I could assist and you will have just as much fun with this product as I have.