What should you check before starting a long journey with a tractor-trailer?

Before embarking on a long journey with a tractor-trailer, checking the load distribution is critical for ensuring safety and vehicle stability. Proper load distribution affects the center of gravity and helps maintain balance during transit. An unevenly distributed load can lead to difficulties in steering, increased tire wear, and a risk of tipping over, especially when navigating turns or uneven terrain.

In addition to safety concerns, improper load distribution may lead to compliance issues with weight regulations, which can result in fines or penalties. Furthermore, a well-distributed load ensures optimal performance and fuel efficiency, making the journey smoother and more economical.

While the other options may contribute to the overall comfort or functionality of the vehicle, they do not directly impact the vehicle's safety and operational integrity during a long journey to the same extent as load distribution does.