What can excessive weight over an axle cause in terms of vehicle performance?

Excessive weight over an axle can lead to steering misalignment because it increases the stress on suspension components and can affect the geometry of the steering system. When the weight distribution is uneven, it can cause tires to wear unevenly, resulting in a misalignment of the vehicle's wheels. This misalignment can lead to difficulties in steering and handling, as the vehicle may pull to one side or require more effort to maintain a straight path. Maintaining proper weight distribution is critical for ensuring that the vehicle operates smoothly and safely.

The other options present benefits or improvements that are unlikely to result from excessive weight over an axle, as increases in weight typically do not enhance vehicle performance in those areas. Instead, excessive weight can have detrimental effects on control and efficiency.