Chevrolet 2007 Avalanche Owner's Manual page 172

To prevent damage or loss of cargo while you are
driving, check now and then to make sure the
luggage and cargo are still securely fastened.
Be sure the cargo is properly loaded.
•
If small heavy objects are placed on the roof,
cut a piece of 3/8 inch plywood to fit inside
the crossrails and siderails to spread the load.
Tie the plywood to the siderail supports.
•
Tie the load to the crossrails or the siderail
supports. Use the crossrails only to keep
the load from sliding. To move a crossrail, turn
the release knobs, on both sides of the rail,
counterclockwise to loosen it. Slide the
crossrail to the desired position balancing the
force side to side. Turn the release knobs,
on both sides of the rail, clockwise to tighten
it. Try to slide the crossrail back and forth
slightly to be sure it is tight.
172
•
If you need to carry long items, move the
crossrails as far apart as they will go. Tie
the load to the crossrails and the siderails
or siderail supports. Also tie the load to
the bumpers. Do not tie the load so tightly
that the crossrails or siderails are damaged.
•
After moving a crossrail, be sure it is securely
locked into the siderail.
Your vehicle has a Center High-Mounted
Stoplamp (CHMSL) located above the rear glass.
If items are loaded on the roof of the vehicle,
care should be taken not to block or damage
the CHMSL unit.
I n f o r ma t i o n P r o v i d e d b y :