http://grassrootsmotorsports.com/new...er-weights.php
Like a table/stool that wobbles, your car wobbles not left/right, or front/back, but diagonally, or "cross corner". LF/RR or RF/LR
By equalizing the total amount of weight on each diagonal with the other diagonal, you eliminate the wobble, and make the car so it handles equally in each direction. This is done by shortning the suspension on the heavy diagonal, or lengthening the suspension on the light diagonal.