Mercedes-Benz 2003 M-Class Operator's Manual page 190

Operation
Driving instructions
Crossing obstacles
!
Obstacles can damage the vehicle
undercarriage or suspension compo-
nents. If possible use the assistance of
a second person.
After off-road driving or crossing obsta-
cles, inspect vehicle for any damage,
especially vehicle undercarriage and
suspension components. Failure to do
so can adversely affect the vehicle's fu-
ture performance, including increased
chance of an accident.
190
Select gear range 1 on the automatic
transmission ( page 114).
Check the vehicle clearance before
crossing obstacles.
Cross obstacles (e.g. tree stumps or
big rocks) very slowly by aiming one of
the front wheels at the center of the ob-
stacle, and repeat same with the rear
wheel.
Special attention is needed when you
cross obstacles on a steep incline.
The vehicle could slide sideways as a
result of its possible slanted position.
Ruts
A number of off-road tracks or other by-
ways have deep ruts which can cause the
undercarriage to come in contact with the
ground.
Select gear range 1 on the automatic
transmission ( page 114).
Drive next to the ruts rather than
through them if at all possible.