Explorer1016 wrote:
... I have also setup several off road Jeeps with big axles, big tires and complicated suspension geometry and if the caster is set too far positive the Jeep will wander all over the road. It is called over steer and is a symptom of incorrect caster. Consequently if the caster is too far negative it is very difficult to steer and make corrections, this is under steer. Hope this helps you out.
http://www.jeepforum.com/forum/f8/why-your-steering-wanders-seems-loose-445430/I think Explorer1016 has reversed the logic of caster. IMHO