I used to do wheel alignments with a Hunter Engineering laser system that measures caster, camber, and toe down to 1/100 of a degree. That amount of accuracy has only one purpose- - - -to impress the customer! A pretty acceptable alignment can be done with a plumb bob, a carpenter's level, and a tape measure by someone who knows a little math and can make accurate measurements. Some methods just save time, and in a commercial shop time is money. BTW, that Hunter system sells for a little over $40,000.00!
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!