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

Your answer is correct because the height adjustment system of the trailer is designed to keep the drawbar level with the coupling height of the towing vehicle. This ensures a safe and stable connection during towing. The towing vehicle’s height adjustment system or a directing person cannot directly control the trailer’s drawbar height; it is the trailer’s own system that makes this adjustment. Understanding this helps you recognize that maintaining proper alignment primarily depends on the trailer’s equipment.