The year they avoided Kiler it was because it was completely impassable to even 4WD vehicles due to mud.
Based on my experience a few years ago at Eroica Gaiole, be sure to bring a plastic bag to cover both the top and bottom of your leather saddle. I didn't and my saddle was completely ruined by the spray coming up from the back wheel (not to mention that everybody on that ride got completely drenched and covered in brown mud). I had to periodically use sticks to clear the mud from around the stays and forks when the buildup became so great that the wheels stopped turning. Hopefully we won't get into conditions that bad in Cambria/Paso.