Okay, forgot about caster...
Caster is the tilting of the uppermost point of the steering axis either back or forward (when viewed from the side). A backwards tilt is positive caster and a forward tilt is negative. Caster influences (directional?) control of the steering but does not affect tire wear, or so I am told. Caster is affected by the vehicle height, therefore a body lift jacks it all up just as much as a suspension lift...according to what I have been told. Supposedly its important to keep the body at its designed height (never EVER lift your pathy! LOL).
Overloading your pathfinder with guns, gear or beer, or a weak or sagging set of rear springs will affect caster.
When the rear of the vehicle is lower than its designated trim height, the front suspension moves to a more positive caster. If the rear of the vehicle is higher than its designated trim height, the front suspension moves to a less positive caster. So a factory Pathfinder sits lower in the rear right? Maybe I should let some air outta my shocks...lol
With too little positive caster, steering may be touchy at high speed and wheel return ability may be lessened when coming out of a turn.
If one wheel has more positive caster than the other, that wheel will pull toward the center of the vehicle. This condition will cause the vehicle to pull or lead to the side with the least amount of positive caster.
If I understand it correctly...
Hope that helps some.