When backing up, what should you primarily focus on to avoid jackknifing?

Focusing on ensuring the trailer follows the correct path while backing up is essential in preventing jackknifing. Jackknifing occurs when the trailer swings out to an angle that is too sharp compared to the towing vehicle, leading to instability and potential accidents. By concentrating on the trajectory of the trailer, you can maintain control and ensure that it moves along the desired path behind the vehicle.

This requires good spatial awareness and understanding of how the vehicle and trailer interact, particularly during turns. Keeping the trailer in line and aligning it with the towing vehicle will help in preventing sharp angles that can lead to jackknife situations.

While mirrors are important for visibility, relying solely on them isn't sufficient, as they may not provide a complete view of the trailer's position relative to the towing vehicle or surrounding obstacles. Similarly, accelerating while turning can increase the risk of jackknifing, as speed can exacerbate the angle at which the trailer moves relative to the truck. Lastly, focusing only on the rear of the trailer may cause you to lose sight of your overall path and how both the vehicle and trailer are aligned, potentially contributing to a jackknife scenario.