When backing up the tractor to couple with the trailer, you must:

The process of backing up the tractor to couple with the trailer involves crucial alignment to ensure a secure and safe connection. Ensuring that the fifth wheel slot is in line with the trailer kingpin is essential for a proper coupling. When the fifth wheel is correctly aligned with the kingpin, it allows for smooth engagement and locking of the trailer to the tractor, which is vital for safe operation on the road.

If the alignment is off, it can lead to miscouplings or damage to both the trailer and the tractor, which could result in safety hazards while driving. Proper alignment also assists in making the coupling process more efficient and reduces the chances of having to reposition the tractor multiple times, saving time and effort.

This choice emphasizes the importance of accuracy and attention to detail when backing the tractor, which are critical skills for a driver holding a Class A license. The other options, while they touch on relevant concepts, either misrepresent or do not capture the key focus needed for successful coupling.