Run the 18's, it will look fine with that tire on there. The obs trucks are smaller bodied then the nbs, nnbs trucks. Just my op but I think it will look good with those wheels..
JOHN
Just remembered my spare is 28"...I can slap it on and see how it looks
95 C1500 LM7, built 4L60e, Circle D 3200, LT's, Nelson tune, open differential, 3.42, and LS1 e-fans. Tractionless
what drop do you have on your truck now? i see you said you "dont" have a c notch? is the axle in the back flipped? if so does it bottom out on the frame any?