What should you note regarding the trailer coupling, when transporting pedelecs on a rear-mounted carrier system?

You answered everything correctly. When transporting pedelecs (electric bicycles) on a rear-mounted carrier system attached to the trailer coupling, you must consider three key points. First, the rear-mounted carrier must be designed and approved for carrying such loads to ensure safe transport. Second, the trailer coupling must have a sufficient vertical load capacity (Stützlast) to support the weight of the carrier and pedelecs without risking damage or safety problems. Third, the car's tire pressure should be adjusted according to the manufacturer's recommendations for additional loads. This helps maintain safe handling and tire wear, as extra weight at the rear can affect your vehicle's balance and braking. These precautions ensure safety and compliance with German traffic regulations.