the course is being built so that it can be negotiated on street tires. of course, the more aggressive dual-sport knobbies like TKC80s or Karoos will be an advantage, but you will be able to have plenty of fun on the more street-biased Tourances, Distanzias, etc.
however, rain will be a challeng. the dirt is that red clay like in georgia and does get slippery when wet.
to help that, we'll have a tractor with a boxblade on-site for the week. i am hoping that it's the kind of boxblade with ripper teeth. we should be able to scrape things into reasonable shape if it rains.