O.K i'm in.
Joe ,hopefully you are still in Cal.,
i regrooved my tires in Eloy, A.Z, @ Exit 203.
so you might still make it.
here is MY 1st experience:
i regrooved 2 Super Single drive tires, about 6 months ago.
at that time they had 274,000 mil. on, and about 4/32" on the inners threads...