I've heard of people swapping the spring main leaves end-for-end which puts the center bolt closer to the middle of the wheel opening. It's also possible to drill extra holes in the rear end mount pads to move the centerline of the axle tube forward or back for a little fine-tuning of the wheel center position.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!