In some designs, the car's roll center seems to move up and down with the up/down motion of the chassis. That is, as pitch-changes occur, the R/C (and the CG with it) tends to follow, as one.
Other designs don't seem to do this. On these, the rc seems to stay at much the same height, even as the car's pitch changes. As the chassis (with its cg) moves up and down, the roll center height stays relatively the same -- which would cause the moment acting on the springs (as the car goes into roll) to be a constantly changing thing as the car's pitch attitude changes.
These seem to be two very different, almost opposite approaches. On the surface, it would seem that trying to keep the r/c and c/g distance from one another a constant thing (regardless of pitch) would be a good thing... But then I wonder why everybody doesn't do it -- which they don't seem to at all!
Can anyone shed any light on this area of mystery for me?