Where is the best position for the load on a tractor-trailer?

The best position for the load on a tractor-trailer is directly over the rear axles. This placement ensures optimal weight distribution, which is crucial for maintaining stability and control while driving. When the load is centered over or slightly in front of the rear axles, it helps prevent excessive sway and reduces the risk of tipping, especially when cornering or navigating through turns.

Additionally, this positioning aids in preventing undue stress on the vehicle's components, such as the tires and suspension system, which can lead to premature wear if the load is improperly distributed. Proper load distribution is also important for compliance with weight regulations and for preventing damage to roads.

While placing the load over the fifth wheel can provide some benefits, it might not offer the same level of stability as positioning the load over the rear axles. The midway point of the trailer or directly over the trailer axle might also lead to imbalances that could affect handling characteristics, particularly during maneuvers. Hence, carrying the load directly over the rear axles is recognized as the best practice for both safety and performance in a tractor-trailer setup.