What must be checked regarding the positioning of the fifth wheel?

The positioning of the fifth wheel is critical for safe tractor-trailer operation, particularly during turns. The correct answer emphasizes that the fifth wheel must be positioned to clear the landing gear to prevent any interference when the truck is turning. This clearance is essential to avoid damage to both the tractor and trailer, and it ensures that the turning radius is not compromised, which can lead to accidents or maneuvering difficulties.

Proper clearance allows for smoother movements without the risk of the landing gear striking the fifth wheel or other components. This aspect is crucial in maintaining control and ensuring the safety of the vehicle while it is in motion, particularly in tight spaces or during low-speed maneuvers. Thus, understanding the importance of proper fifth wheel positioning is vital for professional drivers to manage their vehicles effectively and safely on the road.