I posted this in response to another post, but thought it might be of interest to those following this post. "We always used the rule of thumb that the front of the ladder bars, or the intersection point (imaginary lines extended past the bars) of a 4 bar should intersect the line drawn from the contact patch on the tire up through the center of gravity. That means that shorter bars could point more down. Long ladder bars could get the same effect , but had to intersect at a higher point. As cars became lower, packaging made it easier to use shorter bars. Also, less adjustment was required to make a larger difference." Hope it is of help to someone.