This run is definitely intended to be stocker friendly....but based on Knox's posted requirements, the minimum tire size is 31", with good quality AT or MT tires. I don't know what size comes stock on your ZJ.
From what I saw on the weekend, the ice on the mud holes is still not even close to supporting a Jeep's weight....so unless we see some pretty cold weather to build up thicker and stronger ice, you will probably find making this run on dedicated winter tires to be somewhat difficult.