Christian:
If the KT roadwheels are so right, but the suspension is a bit 'off' because of the left/right stagger, why not truncate the torsion leaves/bars in the center of the chassis... so that the left/right leaves meet in the middle... and you don't have to stagger the left-right axles? And if the leaves/bars prove to bee to stiff, why not use more flexible ones, or that modded torsion kit from Axel, AFV, or whomever over there makes it?
Just thinking... again... (been static way too long...)