Hummer 2007 H2 Owner's Manual page 327

Log Crossing
Using the proper technique, your vehicle will cross
logs up to 10 inches (25.4 cm) in diameter.
Approach the log at approximately a 15° angle (A)
with the transmission in FIRST (1) and the
transfer case in 4LO LOCK and "walk" your vehicle
over, one tire at a time. It may be necessary to
modulate your brake pedal and accelerator
to avoid spin-out. Ease the vehicle down from the
log with your brake.
Driving on Off-Road Hills
Off-road driving often takes you up, down, or
across a hill. Driving safely on hills requires good
judgment and an understanding of what your
vehicle can and cannot do. There are some hills
that simply cannot be driven, no matter how
well built the vehicle.
CAUTION:
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Many hills are simply too steep for any
vehicle. If you drive up them, you will
stall. If you drive down them, you cannot
control your speed. If you drive across
them, you will roll over. You could be
seriously injured or killed. If you have any
doubt about the steepness, do not drive
the hill.
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