How often should the components of the fifth-wheel coupling be inspected? How often should the components of the fifth-wheel coupling be inspected?

• Possible answers:

   
• A. Every 5,000 km (3,000 miles)
• B. Every 10,000 km (6,000 miles)
• C. Every 15,000 km (9,000 miles)
• D. Every 20,000 km (12,000 miles)