I agree with Dylanand. There are reasons why the ipad is needed for an external display. I am looking to use my ipad as an external Video display and it has nothing to do with just using it as a expensive monitor. It's that I'm using it in a mobile application. I have my Video camera mounted in my Jeep for off road filming. The ipad is mounted in my dash and needs to display what the video camera is capturing. So as you can see from my application needs, mounting another monitor in a vehicle is not exactly "practical" solution.
If someone knows of an appropriate app or hardwire solution for this, that would be great!