What control and service work has to be carried out regularly on a fifth wheel?

The selected combination of lubricating the fifth wheel and checking its fixing to the frame is correct because both actions are necessary for safe and effective operation. According to German traffic regulations, regular maintenance of towing equipment is essential to ensure stability and prevent accidents.

Lubrication helps to reduce friction and wear, while checking the fixing ensures that the fifth wheel is securely attached to the vehicle. Neglecting either of these maintenance tasks can lead to mechanical failure or unsafe driving conditions, which German traffic laws aim to prevent for the safety of all road users.

It's important to remember that the notion that fifth wheels are always maintenance-free is incorrect; they require regular attention to ensure safe towing.