Mercedes-Benz GLS 2023 Operator's Manual page 282

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280 Driving and parking
Further information can be obtained at a qualified
specialist workshop.
For a detachable trailer coupling, it is essential to
comply with the operating instructions of the
trailer coupling manufacturer.
Couple and uncouple the trailer carefully. If you
do not connect the trailer to the towing vehicle
correctly, the trailer may become detached.
Observe the following notes on the tongue weight:
Do not use a tongue weight that exceeds or
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falls below the permissible tongue weight
Use a tongue weight as close as possible to
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the maximum tongue weight
Do not exceed the following values:
Permissible towing capacity
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Permissible rear axle load of the towing vehi-
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cle
Permissible gross weight of the towing vehicle
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Permissible gross weight of the trailer
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Maximum permissible speed of the trailer
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Ensure the following before starting a journey:
The tire pressure on the rear axle of the tow-
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ing vehicle is set for a maximum load
The lighting of the connected trailer is opera-
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tional
In the event of increased rear axle load, the car/
trailer combination must not exceed a maximum
speed of 62 mph (100 km/h) for reasons con-
cerning the operating permit. This also applies in
countries in which the permissible maximum
speed for car/trailer combinations is above
62 mph (100 km/h).
Vehicles with AIRMATIC or E-ACTIVE BODY CON-
TROL: if the socket of the trailer hitch is occupied,
e.g. by a trailer or rear bicycle rack, the vehicle is
set to the normal level at speeds greater than
19 mph (30 km/h). This is done regardless of
which drive program has been selected.
Attaching the ball neck
& WARNING Risk of accident and injury due
to incorrectly installed ball neck
If the ball neck is not correctly installed and
secured, it may become loose during a jour-
ney and endanger other road users. There is a
risk of fatal injuries.
Install and secure the ball neck as
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described in the ball neck manufactur-
er's installation instructions.
If a ball neck is installed, ensure sure
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that it is properly secured before every
journey.
& WARNING Risk of accident due to a ball
neck that is not correctly installed or
secured
If the ball neck is not correctly installed and
secured, the trailer may come loose.
Install and secure the ball neck as
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described in the ball neck manufactur-
er's installation instructions.

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