Im 29. The dnr runs it and they dont have any ohv parks that allow trucks in them, there are always alot of 4 wheelers and dirtbikes out there anyway so it would not be safe for them with trucks out there too. There just arent any good trails out here that I know of, but there are plenty of places out here if you just want to play in the mud. Stay out of the cornfields and off private property, the cedar river has some places that are easy to find and get real muddy.