I'm just throwing this out. But for excellent handling wouldn't you want to run solid control arm bushings in the rear lower control arms? Then taking this another step forward, why not eliminate the bushing, and make a solid boxed lower arm with some sacrifical surface between the arm and frame connection? Possible a aluminum or polyurathane washer so you don't have steel on steel, yet very rigid of course. I do realize that you would have more suspension/road noise with this set up. But it would take pretty much all the flex/roll out of the rear. Suggestions or ideas let me know. I'm thinking of firing up the welder.