Don't have any info but I have raced enduros in that area (they have one next weekend on the same trails) and it is all rocks! It makes you think you are on the east coast. The enduro was always fun so I would assume the trail ride will be good also.
The club is Wausau Area Enduro Riders 715-845-8323.
I would go but I am going to punish myself at the Moose Run this weekend.