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

Your answer was correct because all three points are essential considerations when transporting pedelecs on a rear-mounted carrier system.

1. The rear-mounted carrier system must be suitably designed to ensure it can safely support the weight and dimensions of the bikes being transported. This is crucial for maintaining vehicle stability and preventing accidents.

2. The trailer coupling must have a suitable vertical load capacity. This means that it must be able to handle the additional weight without risking failure, which can lead to dangerous situations on the road.

3. Adjusting the car’s tyre inflation pressure appropriately is important because the added weight from the bikes can affect the vehicle's handling and braking performance. Proper tyre pressure helps ensure good contact with the road and improves safety.

Together, these considerations reflect adherence to safety regulations as outlined in the German Road Traffic Regulations (StVZO) and ensure safe transport of bicycles, minimizing risks for the driver and other road users.