It affects the shackle angle, cause you have moved the whole spring rearward, but you haven't moved the chassis pivot point, so more slant of the shackle. It sure hasnt caused any problem for me.
I did some very rough calculations, and i got around ten pounds less weight on the rear wheels from the wheelbase change. Certainly not enough to concern me, since i quadrupled that weight change by moving the battery to the trunk.
Condidering how goofy (and tire size restrictive) the original location is, i would do the change again in a heartbeat.
