Why must you check the coupling height on a tractor-trailer?

Checking the coupling height on a tractor-trailer is crucial for ensuring a proper connection between the tractor and the trailer, which is essential for safe travel. The coupling height affects how well the fifth wheel engages with the kingpin of the trailer; if the heights are not aligned correctly, it can lead to an insecure connection. This can result in the trailer detaching during operation, posing significant safety risks to the driver, other road users, and the cargo being transported.

Maintaining correct coupling height also facilitates smoother operation while turning and reduces wear on components, enhancing the longevity and performance of the vehicle. Therefore, ensuring proper coupling height is a key aspect of pre-trip inspections to promote safe and stable driving conditions.