Hummer 2008 H2 Owner's Manual page 426

6. Turn the wheel wrench clockwise to raise the jack
head to the lifting point.
Front Flat Tire – Jack
7. Front Flat Tire: Position the jack under the vehicle
on the front lower control arm behind the flat tire.
5-90
Rear Flat Tire – Jack
Rear Flat Tire: Place the jack under the curved
rear axle pad. Make sure the jack head is positioned
so that the rear axle pad is resting securely on
the jack head.
CAUTION:
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Getting under a vehicle when it is jacked up is
dangerous. If the vehicle slips off the jack, you
could be badly injured or killed. Never get under
a vehicle when it is supported only by a jack.