Chevrolet VENTURE 2001 Manual page 196

Turn the release knobs counterclockwise to unlock the
crossrails. Slide the crossrails forward or back, as
needed, to accommodate loads of various sizes.
Your luggage carrier has
release knobs set in the ends
of each crossrail.
After repositioning the crossrails, be sure to tighten the
release knobs by turning them clockwise. This will lock
the crossrails in place.
-
Use the tie down loops on
the slider to help secure
large loads.
2-83