Dodge Grand Caravan Owner's Manual page 236

234 UNDERSTANDING THE FEATURES OF YOUR VEHICLE
Make sure the directional arrows on the crossbars align
with the directional arrows on the side rails. Set the
crossbars into the deployed positions.
Crossbar To Side Rail Installation
Once the crossbars are set into position, tighten the thumb
screws completely.
Tightening Crossbar
Stowing The Crossbars
Reverse the procedure to stow the crossbars, again, taking
care to keep hand clear of pivoting joint. Crossbars are
identical and can be stowed in either rail nest. Once the
crossbars are stowed, tighten the thumb screws completely.