Mercedes-Benz G-Class 2018 Owner's Manual page 444

The tongue weight must not be below
#
50 kg.
Use a tongue weight that is as close as
#
possible to the maximum permissible
tongue weight.
Tongue weight
Model Maximum tongue
All models
Permissible rear axle load during trailer
operation
Axle load
Model
All models
weight
140 kg
Axle load
1900 kg
Technical data 441