If the overall height difference of the wheels is 3 inches, wont that only effect the height difference at the hub by 1.5 inches, and isnt it going to be the height difference at the hub that determines where the suspension carries the chassis?
I know I'm pretty redneck, and cant tell cheap wine from good wine, etc... But I doubt that I could even spot a 1.5 inch difference in the height of the front and the rear.
I'm too lazy to do the math to figure out how many degrees that comes to for the effect it has on the steering... Would also have to know the wheel-base... The longer the wheel base, the lesser the detrimental effect to the caster angle would be, wouldnt it?