Mercedes-Benz R-Class Owner's Manual page 241

Operation
Trailer towing*
Vehicles with rear axle level control*
G Risk of injury
Never lock, unlock, open or close a vehicle
door or tailgate when coupling up or decou-
pling a trailer. The vehicle level could
change and you could endanger yourself or
others.
Never press the ADS button* or operate the
level control* while you are coupling up or
decoupling a trailer.
Make sure the selector lever is set to P.
X
Depress the parking brake.
X
Close the doors and tailgate.
X
Position the trailer level behind the vehicle.
X
Couple up the trailer.
X
Establish the electrical connection
X
between the vehicle and the trailer.
Start the engine.
X
Vehicles with the AIRMATIC package*
G Risk of injury
Never lock, unlock, open or close a vehicle
door or tailgate when coupling up or decou-
pling a trailer. The vehicle level could
change and you could endanger yourself or
others.
238
Never press the ADS button* or operate the
level control* while you are coupling up or
decoupling a trailer.
Make sure the selector lever is set to P.
X
Depress the parking brake.
X
Start the engine.
X
Set the vehicle to highway level
X
( page 152).
Y
Switch off the engine.
X
Close the doors and tailgate.
X
Position the trailer level behind the vehicle.
X
Couple up the trailer.
X
Establish the electrical connection
X
between the vehicle and the trailer.
i
If you have coupled a trailer, the vehicle
will remain at highway level.
The vehicle automatically lowers to high-
way level if you drive faster than 8 km/h
with a trailer. The vehicle is not lowered to
the high-speed level even if you are travel-
ling at higher speeds.
This also applies when using accessories
that are plugged into the socket of the
trailer coupling (e.g. a bicycle rack).
Decoupling a trailer
G Risk of injury
Do not connect a trailer with an engaged
overrun brake. Otherwise, your hand could
become trapped between the bumper and
drawbar.
!
Do not uncouple a trailer with overrun
brake between the bumper and drawbar,
otherwise your vehicle could be damaged
by the spring action of the overrun brake.
Steel-spring vehicles
Make sure the selector lever is set to P.
X
Depress the parking brake.
X
Secure the trailer against rolling away.
X
Remove the trailer cable and decouple the
X
trailer.
Vehicles with rear axle level control*
Make sure the selector lever is set to P.
X
Depress the parking brake.
X
Start the engine.
X
Close the doors and tailgate.
X
Secure the trailer against rolling away.
X
Remove the trailer cable.
X
* optional