I have 15x12's on mine. I know it's a lot of work, but mine is basically back halfed with a 4-bar setup. The original plan was just to add a big notch for the air ride, and mount the 4-bar inside the frame. Plans changed and a scratch built rear was made. Narrowed the frame by about 6" total, and kept the bars on the outside of the frame. Works like a charm. No rubbing, even with the 325/50-15 drag radials.
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