You want to park your single-axle trailer (overrun brakes, 1000 kg permissible total mass) on a slope. What must you do?

For parking a single-axle trailer with overrun brakes on a slope, it's essential to secure the trailer so it cannot roll away. First, you must pull the parking brake to activate the trailer's own braking system. Second, you need to place wheel chocks under the wheels to provide extra security against rolling, especially on an incline. Engaging the reverse lock (answer 3) is not required and does not substitute for using the parking brake and wheel chocks. Remember: On slopes, always use both the parking brake and wheel chocks for trailers to comply with German regulations and ensure safety. Your selections were correct.