Fastrax review and alignment questions for the pros.

Car hunting on interstate. For one thing you want a positive caster. Something like +1 to +2 degs positive, if you can get it. The caster specs that are listed on alignment sheet are a joke. Look at the spec range on the sheet -1 to 0 degs. No way... I have argued with a few alignment shops over the specs in their machines.
As far as toe, it is always given in inches. I too have wonder why it is not in degs which would make more sense. How far out from the ball joints is the 1/8 inch toe read? I would like to know also.