[landtank]

Where are you getting the info that bias ply tires want zero caster. I did alignments back when everything was bias ply and not once did I see specs requiring zero caster. The one thing we did see is with the advent of steel belted tires and their lower rolling resistance it was recommended to set toe to the minimum spec which was often zero toe.

I set my toe with a tape measure and adjust toe just enough to know that I'm toed in and nothing more.