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 3000 miles (5000 km)
• B. Every 6000 miles (10 000 km)
• C. Every 9000 miles (15 000 km)
• D. Every 12 000 miles (20 000 km)