What is correct when coupling a full trailer?

When coupling a full trailer, it is important to have a person positioned in the driver’s line of vision who can guide the driver. This helps ensure that the vehicle and trailer align correctly and safely. Additionally, this person acts as a lookout to warn the driver about any obstacles or road users that the driver cannot see during the maneuver. These two points are critical to prevent accidents and ensure safe coupling.

The third option, holding the drawbar until it has locked into the hitch, is not correct because the coupling mechanism is designed to lock securely by itself. The driver should rely on proper alignment and guidance rather than manually holding the drawbar. This is why option 1 and 2 are the correct answers in German traffic rules for safely coupling a full trailer.