I havent towed a lot with it (5x7 trailer with a diff etc), but it towed that fine, probably dropeed teh car by half a cm. Theyre not very stiff tho.

holy s**t dude...

i personally have no idea what your on about.
why dont you go up to the guy that owns that gt and ask what option the rims are? or if they are the standard one.

dont forget to write this down...