Each alignment is different. Sometimes it's necessary to tilt the axle with shims to get the right caster adjustment, sometimes not. If your alignment technician is familiar with straight axle work, he should be able to determine whether or not a shim is needed. If only one side was out of limits, we used to use special fixtures and BIG hydraulic jacks to bend axles into proper alignment. That's not done much anymore because the equipment isn't available at most shops.
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!