CDL Doubles/Triples Endorsement Practice Exam

The recommended approach to coupling a second trailer is to ensure proper alignment before lowering the dolly. This is crucial because misalignment can lead to difficulties in successfully connecting the trailers or even damage to the equipment. When the dolly is aligned correctly with the second trailer's kingpin, the coupling process becomes smoother and safer, minimizing the risk of accidents.

Proper alignment involves positioning the tow vehicle so that the dolly and the second trailer are directly in line with one another. This ensures that when the dolly's fifth wheel engages with the kingpin of the second trailer, it does so securely and without obstruction. This attention to alignment is what helps ensure the stability of the entire rig during operation.

The other methods of coupling have inherent risks. For instance, driving in reverse to align the trailers can lead to poor visibility and misjudgments in distance, which can contribute to unsafe conditions. Starting the coupling process without performing an inspection overlooks essential safety checks and may lead to problems once on the road. Uncoupling the first trailer before coupling the second could lead to instability, especially if the dolly is already attached to the first trailer, thus complicating the coupling of the second trailer.

Overall, ensuring alignment before lowering the dolly not only promotes safety