Mark one answer
Every 9000 miles (15 000 km)
Every 6000 miles (10 000 km)
Every 12 000 miles (20 000 km)
Every 3000 miles (5000 km)
Explanation: Fifth-wheel couplings need regular inspection and lubrication. This should be carried out either every 6000 miles (10 000 km) or monthly - whichever is the sooner.
Category: Vehicle Condition
References: The Official DVSA Guide to Driving Goods Vehicles: Section 2
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