As far as I know, u just unbolt them at the four corners. 2 bolts per corner. Bolts are under the plastic "feet" which seperate in the middle into 2 halves. There's an article on here somewhere about how to seperate them. It's in a section dealing with installing roof/rack lights.
edit:
See this link:
http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?t=15005
_________________
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