Dodge Durango 2013 Owner's Manual page 302

300 UNDERSTANDING THE FEATURES OF YOUR VEHICLE
Position the crossbars across the roof making sure the
letters on the crossbars align with the matching letters on
the side rail.
Positioning Crossbars
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.