Mercedes-Benz GLS 2020 Operator's Manual page 251

Attaching the ball neck
& WARNING Risk of accident and injury
due to an incorrectly installed ball cou‐
pling
If the ball coupling is not installed and
engaged correctly, it may become detached
during travel and endanger other road users.
There is a risk of fatal injury.
Install and secure the ball coupling as
#
described in the ball coupling manufac‐
turer's installation instructions.
When the ball coupling has been instal‐
#
led, ensure that it is correctly secured
before every trip.
& WARNING Risk of accident due to an
incorrectly installed and secured ball
coupling
If the ball coupling has not been correctly
installed and secured, the trailer can become
detached.
Install and secure the ball coupling as
#
described in the ball coupling manufac‐
turer's installation instructions.
When the ball coupling has been instal‐
#
led, ensure that it is correctly secured
before every trip.
Requirements:
The vehicle is secured against rolling away.
R
Attaching the ball neck
Remove cover 1 from the ball neck mount
#
in the direction of the arrow.
Driving and parking 249
Store cover 1 so that it cannot move
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around.
Observe the manufacturer's installation
#
instructions.
Observe the notes on loading the vehicle.
Coupling up/uncoupling a trailer
& WARNING Risk of injury from the vehicle
level being changed
Vehicles with level control system: the
vehicle level may be changed unintentionally,
e.g. by other persons. You may become trap‐
ped if you couple up or uncouple a trailer
while the vehicle level is changing. In addi‐
tion, other people could become trapped if
their limbs are between the vehicle body and
the tires or underneath the vehicle.
When coupling up or uncoupling a trailer,
make sure that:
The doors or tailgate are not opened or
#
closed.