Sean the first time I ran this trail was with the local Bronco club (5+yrs ago) and a guy in a cut-up red Bronco with 38+ tires ran the V-notch. The driver of the rig was a owner or part owner in Driven auto parts. It was amazing the only place he had problems was crossing over to get out, but...
Shoots is right about the other canyon being a fun, tight for a 80 IMO.
Here is a picture of the bling mobile coming down the ledge, it cleared it at that time.
And yes Sean they are 37 SSR in the picture.