Missouri CDL Practice Exam

When a trailer is too high during the coupling process, it can lead to an incorrect coupling. This occurs because the fifth wheel may not properly engage with the kingpin of the trailer, which is crucial for a secure connection. When the trailer is elevated beyond the proper height, the alignment necessary for the locking mechanism may fail, preventing the two components from securely locking together. This can result in a loose connection that could compromise safety while driving, potentially causing the trailer to separate while the vehicle is in motion.

In contrast, coupling would indeed be easier if the trailer were at the correct height or slightly lower, as this would facilitate proper alignment with the fifth wheel. A disconnected trailer is a serious hazard that usually arises from either improper coupling or unintentional detachment due to faulty equipment rather than just height issues. Finally, claiming that nothing will happen overlooks the critical importance of proper coupling in ensuring the safety and stability of the vehicle during transport.