I have seen on E-Bay for $116.99 a 7" GPS/wireless reversing camera combo with lifetime maps and hands free Bluetooth.
For that price why get just a reversing camera, or just a GPS, or just a hands free kit. And wireless means not spending all morning taking the car to bits to run a wire from the dash to the tailgate.
What I would like though is to work out how to wire one to my reversing lights so that it works automatically. My existing camera does not do that.
It's a NSW E-Bay seller offering a 2 year warranty and free delivery -
http://www.ebay.com.au/itm/7-Car-GPS...item3cc5edf3d4
Is your WH Grand a Navigator model with a GPS on the dash? The only way to wire a camera into my WH would be by replacing the stereo with an after market unit.