Welcome and good luck! Bob Land Racing did Laughlin and a number of other notable offroad events - not sure if his site is still around but you may wish to search the web or this site. Cyrk, you have the autographed picture with stats on it - see what he lists for tires.

I'd think you'd most importantly want to use tires that competitors had used in Baja or Dakar or any of the other big events.