Hummer 2007 H2 Owner's Manual page 161

Adjusting the Crossrails
Adjust the crossrails to fit your load by doing the
following:
1. Loosen the lock knobs on the crossrail
supports by turning the knobs
counterclockwise. Only loosen them enough
to allow the crossrails to slide easily.
2. Slide the crossrails to the desired position,
being sure to align the lines in the side rails
with the arrows on the crossrail supports.
3. Tighten the lock knobs and then try to move
the crossrails back and forth to be sure that
they do not move.
4. Once you load the cargo onto the crossrails,
secure it by tying it down to the crossrail
support cargo tie-down loops. Do not
load cargo directly on the roof of your vehicle.
Be sure you do not cover the roof marker
lamps or the Center-High-Mounted
Stoplamp (CHMSL), if your vehicle has this
feature, with cargo.
To prevent damage or loss of cargo check now and
then to make sure the luggage and cargo are still
securely fastened and the crossrails are tight.
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