GMC Defense 2006 Owner's Manual Supplement page 73

Front Flat Tire
11. Front Flat Tire: Position the jack under the
vehicle on the front lower control arm behind the
flat tire.
Rear Flat Tire
5-30
12. 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:
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.
CAUTION:
Raising your vehicle with the jack improperly
positioned can damage the vehicle and even
make the vehicle fall. To help avoid personal
injury and vehicle damage, be sure to fit the
jack lift head into the proper location before
raising the vehicle.