Mercedes-Benz GLS 2020 Operator's Manual page 250

248 Driving and parking
Under no circumstances should you try
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to increase the speed to straighten the
vehicle/trailer combination.
Reduce speed and do not counter-steer.
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If necessary, apply the brakes.
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* NOTE Damage to the engine as a result
of overheating
If you retrofit a trailer hitch, modifica‐
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tions to the engine cooling system may
be necessary, depending on the vehicle
model.
When retrofitting a trailer hitch, observe the
fastening points on the chassis.
Retrofitting a trailer hitch is permissible only if a
trailer load is specified in your vehicle docu‐
ments. If this is not the case, the vehicle is not
approved for trailer operation.
Further information can be obtained at a quali‐
fied specialist workshop.
If the trailer coupling is removable, 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 trailer load
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Permissible rear axle load of the towing vehi‐
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cle
Permissible gross weight of the towing vehi‐
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cle
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
Vehicles without LED headlamps or MUL‐
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TIBEAM LED headlamps: the headlamps
have been set correctly
In the event of increased rear axle load, the vehi‐
cle/trailer combination may not exceed a maxi‐
mum speed of 62 mph (100 km/h) for reasons
concerning the operating permit. This also
applies in countries in which the permissible
maximum speed for vehicle/trailer combinations
is above 62 mph (100 km/h).