You are driving a car with a fully loaded trailer equipped with overrun braking. What special aspect should be noted here?

You answered everything correctly. With a fully loaded trailer equipped with overrun brakes, there are several important points to remember. First, during long downhill drives, the trailer’s brakes can overheat because they are used more intensively, potentially reducing braking effectiveness. Second, the overrun brake system does not function when the vehicle and trailer are stationary on an uphill slope, so relying on it in this situation is unsafe. Third, before separating a trailer from the towing vehicle, you must always set the trailer’s parking brake to prevent it from rolling away. Remembering all these aspects will help you handle trailers with overrun brakes more safely.