Excessive negative caster can lead to which of the following?

Excessive negative caster can indeed lead to increased steering effort for the driver. Caster angle affects the self-centering action of the steering system, which is important for maintaining directional control. When caster is excessive in the negative direction, the wheels may not align as effectively, requiring more input from the driver to maintain straight-line travel. This can result in a heavier or tighter feel in the steering, causing fatigue during prolonged driving or tight maneuvering.

In contrast, alterations in caster can impact overall vehicle dynamics. While some configurations may enhance stability during cornering or straight-line driving, excessive negative caster does not contribute positively to those aspects. Instead, it may hinder lateral stability and can create undesirable handling characteristics, especially when navigating turns.