Installing the ball coupling
WARNING
If the vehicle/trailer combination is not secured, the trailer may come loose. As a result, you could cause an accident.
Observe the ball coupling manufacturer's installation instructions and special instructions for use.
Mercedes-Benz recommends that you only use ball couplings that have been tested
and approved by Mercedes-Benz. This helps to avoid damage to the vehicle.

Protective cap
- Pull protective cap 1 in the direction of the arrow out of ball coupling recess 2.
- Stow protective cap 1 safely.
- Observe the manufacturer's installation instructions.
WARNING
If the ball coupling is not correctly installed and secured, the ball coupling and the trailer could come loose. As a result, you could cause an accident.
Therefore, please observe the following:
- Ensure that the ball coupling is secured according to the ball coupling manufacturer's installation instructions.
- If the ball coupling cannot be installed as prescribed, detach the ball coupling. Under these circumstances, the ball coupling must not be used for trailer towing.
Have the entire trailer tow hitch checked at a qualified specialist workshop.
See also:
Important notes on tire pressure
WARNING
If the tire pressure drops repeatedly, check
the tires for punctures from foreign objects
and/or whether air is leaking from the valves
or from around the rim.
The tire temper ...
Cabin Quality
If the cockpit in a Cadillac Escalade or Infiniti QX56 feels like a roomy
lounge, the GL550's cabin is eminently more carlike. Don't expect massive
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Overview of sun visors
WARNING
Do not use the vanity mirror while driving.
Keep the vanity mirrors in the sun visors
closed while the vehicle is in motion.
Reflected glare can endanger you and others.
1 Mirror lig ...
