FORD 1999 Explorer - Manual (Page 10)

Drive cautiously to avoid vehicle
damage from concealed objects
such as rocks and stumps. You
should either know the terrain or
examine maps of the area before
driving. Map out your route before
driving in the area. To maintain
steering and braking control of
your vehicle, you must have all
four wheels on the ground and
they must be rolling, not sliding or
spinning.
Sand
When driving over sand, try to
keep all four wheels on the most
solid area of the trail. Avoid
reducing the tire pressure. Instead,
shift to a lower gear and drive
steadily through the terrain. Apply
the accelerator slowly and avoid
spinning the wheels.
If you must reduce the tire
pressure for whatever reason in
sand, make sure you re-inflate the
tires as soon as possible.
Avoid excessive speed because
vehicle momentum can work
against you and cause the vehicle
to become stuck to the point that
assistance may be required from
another vehicle. Remember, you
may be able to back out the way
you came if you proceed with
caution.
Mud
Be cautious of sudden changes in
vehicle speed or direction when
you are driving in mud. Even 4WD
Driving off-road with 4WD or AWD
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