Dodge Durango 2012 Owner's Manual page 308

306 UNDERSTANDING THE FEATURES OF YOUR VEHICLE
Slide the cross bar into to the deploy position by moving
it towards the matching letter in the side rail. Be sure the
crossbar is fully deployed with the crossbar pushed as far
into the slot as possible. Once the crossbar is in place,
tighten both thumb screws completely.
Installing Crossbars
Deploy and tighten the second crossbar to complete the
deployment of the crossbars.
Deployed Crossbars