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Should most of the weight of a load on a tractor-trailer be placed directly over the fifth wheel, at a midway point of the trailer, or directly over the trailer axle?

A. Directly over the fifth wheel
B. At a midway point of the trailer
C. Directly over the trailer axle
D. Anywhere on the trailer bed

Answer :

Final answer:

The most stable and safe location for placing the majority of a load on a tractor-trailer is balanced across the trailer, with a slight forward bias toward the rear axle. An observed bouncing trailer on the highway is more likely to be nearly empty, as the lack of weight results in less damping from the suspension system.

Explanation:

The question pertains to the optimal placement of weight on a tractor-trailer for stability and safety. Correct weight distribution is crucial for maintaining control and preventing accidents. When loading a tractor-trailer, the weight should not be concentrated directly over the fifth wheel nor should it be placed at the extremes of the trailer bed.

Instead, the load should be balanced so that the weight is distributed evenly across the length of the trailer, but with a tendency to have it slightly forward of the trailer's rear axle or axles. This helps maintain the proper distribution of weight onto the tractor's rear axles as well as the trailer's axles, ensuring that neither the front nor the rear of the trailer is excessively loaded.

Regarding the observation of a freight truck's trailer bouncing up and down on the highway, it is more likely that the trailer is nearly empty. A heavily loaded trailer would have less bounce due to the weight dampening the movement from the suspension system. However, an empty or lightly loaded trailer has less weight to suppress the suspension's rebound, leading to more noticeable bouncing.

Learn more about Tractor-trailer weight distribution here:

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