Ok, got it .. slicks only allowed in PRO and treaded DOT's are ok in Prepared and non-DOT Billboards are waived for Prepared if I choose to run them. Yes, I'm talking about the chain tread pattern Billboards.
I also read the rules to be silent on tread depth in Prepared .. correct?
Now all I've got to do is figure out if I have a better chance against Steve Clement in BBPro, or WildBill in BBPrepared ...
Geeeezzzzz!
Naaaa ... it doesn't matter. fun quotient same-same
Thanks for the responses!
Sam