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Question

Difficulty: MediumBalance and Center of Gravity

Placing an excessive proportion of freight behind the trailer's rear suspension can lift weight off the steer axle, severely degrading the front tires' traction and directional control.

Answer: Answer

Answer

True — improper rearward weight distribution unloads the steer axle, compromising front tire traction and directional stability.
The statement is true because improper front-to-back cargo balance that concentrates weight behind the rear tandem axles creates a leverage effect that unloads the front steer axle. Commercial vehicles require balanced weight over the steering axle to maintain the necessary tire-to-road friction for safe directional control.

Step-by-Step Solution

1
Analyze how shifting cargo mass rearward past the trailer's rear axle affects front-to-back weight distribution.
Excessive mass behind the rear axle acts as a counterweight, pivoting the trailer frame and reducing the downward force exerted on the front tractor axles.
Vehicle balance depends on distributing cargo weight appropriately along the longitudinal axis.
2
Determine the operational hazard caused by an underloaded steering axle.
Lighter weight on the steer axle reduces the friction between the steer tires and the road surface, making steering vague, unresponsive, or ineffective during turns.
Steering tires require adequate vertical loading to generate the lateral forces needed to guide the vehicle safely.

Key Concept

Longitudinal Cargo Balance and Steer Axle Traction
Estimated Time:45s
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Topics

Balance and Center of Gravity

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