The drawbar of a full trailer is to be kept level with the coupling height of the approaching towing vehicle. How is this ensured?

The drawbar of a full trailer must be level with the coupling height of the towing vehicle to ensure safe and stable towing. This alignment helps to prevent undue stress on the trailer's coupling and improves vehicle handling.

To achieve this alignment, both the height adjustment system of the trailer and potentially the towing vehicle play crucial roles. The height adjustment system of the trailer allows for the trailer to be raised or lowered to match the towing vehicle's coupling height. Additionally, in some cases, the height adjustment system of the towing vehicle can also be used to ensure a proper fit, which adds flexibility in matching various trailer types.

The presence of a person directing the maneuver can help ensure that the coupling adjustment is performed correctly, but it does not directly contribute to the mechanical alignment itself.

Therefore, the combination of the height adjustment systems ensures compliance with safety regulations, enhancing the overall stability and safety during towing, as established in German traffic laws.