We have one on our 2007 Georgetown 370. They forgot to install it when built. It took 3 shipments before they got the correct color. Personally, the thing is more of a pain then a benefit. We have a towel stuffed in between the cabinet and the extension to stop the creeking noise when closed and we're traveling. It does come up to the counter-top but sits about 2" down. In our case it's another thing to avoid when going in & out of the coach.
If you're still interested contact Greg Wagner at FR. He should be able to assist you.