Mercedes-Benz S-Class Saloon W223 2021 Owner's Manual page 290

288 Driving and parking
Ensure the following before starting a journey:
The tyre 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 100 km/h for reasons concerning the
operating permit. This also applies in countries in
which the permissible maximum speed for car/
trailer combinations is above 100 km/h.
Extending and retracting the ball neck fully electri-
cally
& WARNING Risk of accident due to the ball
neck not being engaged
If the ball neck is not engaged, the trailer may
come loose.
Make sure that the ball neck securely
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engages and locks into place.
* NOTE Damage to the all-electric trailer
hitch due to additional pressure
The all-electric trailer hitch could be mechani-
cally damaged by applying additional pressure
when the ball neck is being extended or
retracted.
Do not make the ball neck extend/
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retract faster by applying additional pres-
sure.
* NOTE Increased risk of damage to prop-
erty due to folded-out ball neck
When the trailer is not coupled or the
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bicycle rack is attached, fold in the ball
neck or, in the case of a fully electric
trailer hitch, retract the ball neck.
* NOTE Damage to the vehicle due to incor-
rect use of the trailer hitch
When a trailer hitch is used to recover a vehi-
cle, the vehicle may be damaged in the proc-
ess.
P223 0288 02
Use the trailer hitch only for pulling a
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trailer or attaching approved carrier sys-
tems (e.g. a bicycle rack).
Requirements:
The vehicle is secured against rolling away.
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The swivel range is clear.
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The trailer cables or adapter plugs have been
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removed.