Sounds like Casner Mountain except today it's a code to open the gate at each end. It is also permit of one run pre week. Thinking May to October dates are the dates allowed. Believe the first club run was 2015.
Trail sounds like Casner Mountain trail which is an APS trail to maintain power lines. That is a narrow trail between two wildernesses. Sycamore Canyon thinking has been a no off-road primitive area for forty years. Hunt unit 6B was where I hunted regularly many years and remember driving west...