Upper paddock is paved, lower has paved lanes. Most guys in the lower park the bikes on the edge of the paved lane and don't worry about plywood.
I was planning on heading over to Grattan tomorrow morning for my first track day. On my way to pick up a trailer to tow my bike there, my engine overheated, got out to see coolant leaking out of the radiator. Anyone leaving from the Ann Arbor area tomorrow morning with an extra spot in their trailer?