I recently asked this question, maybe on another site? I wasn't able to get a phone number or contact for Penns before I booked elsewhere. BUT - one poster said Penns can be contacted via Facebook, on Penns Trucking services page. Try that.

I ran it (or more accurately, jogged once in a while and did far too much walking), along with my two daughters and their boyfriends. It was a hoot, and yes it was hard. My one goal was to not get kicked off the course before it closed and I did manage that. Came in second to last and I'm just fine ...