It's really just a standard Garmin GPS unit sitting in a plastic cover/case that fits the contour of the Wrangler top tray. One of the Jeep magazines had a write up on it awhile ago. I looked at it. The cover is the wrong contour for a KJ and you can buy a better GPS unit alone for less money. Just use a RAM bracket or windshield mount.
Go here to read about the unit itself:
http://www8.garmin.com/products/trailguide/
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My pics!!'03 Rennie w/all Tupperware
Custom Roof Basket
Mopar Tubular Brush Guard
Garmin GPS V & Laptop w/Nav software
RAM products laptop mount
Maglite w/mount
Rear cargo bay tool cabinet
AllJs Rear Shelf
Rear receiver
250k miles!
LOST #CR051230