Dodge Grand Caravan 2019 Owner's Manual page 127

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
GETTING TO KNOW YOUR VEHICLE 125
Once the crossbars are set into position, tighten the thumb
screws completely.
Tightening Crossbar
3