Mercedes-Benz GLC Owner's Manual page 495

Trailer tow hitch
492
Note that the payload and the rear axle load are reduced by the actual payload.
The drawbar noseweight is not included in the trailer load.
Missing values were not available at the time of going to print.
GLC 250 4MATIC
GLC 300 4MATIC
GLC 220 d 4MATIC
GLC 250 d 4MATIC
GLC 350 e 4MATIC
However, the actual noseweight must not exceed the value given on the trailer tow hitch
identification plate. In addition, a distinction should be made between towing a trailer and
using a carrier system on the ball coupling of the trailer tow hitch.
Note also that the payload and the rear axle load are reduced by the actual noseweight.
You can attach carrier systems, e.g. bicycle racks or load-bearing implements, on the ball
coupling. The maximum noseweight of 75 kg applies when using carrier systems on the ball
coupling.
Permissible rear axle load when towing a trailer
Missing values were not available at the time of going to print.
GLC 250 4MATIC
GLC 300 4MATIC
GLC 220 d 4MATIC
GLC 250 d 4MATIC
GLC 350 e 4MATIC
Automatic transmission
88 kg
100 kg
100 kg
Automatic transmission
1363 kg
1370 kg
1370 kg
1438 kg