In pre-trip inspections, what condition must the king pin meet?

During pre-trip inspections, ensuring that the king pin is not broken, bent, or damaged is crucial for safety and functionality. The king pin is a critical component of the fifth wheel coupling system that connects the tractor to the trailer. A damaged king pin can compromise the integrity of the connection between the truck and trailer, leading to potential accidents or failures while on the road.

If the king pin is in poor condition—such as being bent or broken—it can affect the stability of the load and the ability to steer correctly, leading to serious safety hazards. Therefore, inspecting this component for structural integrity supports safe driving practices and compliance with safety regulations. The other options do not focus on the essential structural condition of the king pin that directly impacts the vehicle's safety and performance during operation.