Finding Long's Short Trail is probably easiest from the bottom; right where the PV Connector exits the woods, look for some single track going off at about a 45 degree angle. It's a technical climb, but all rideable on a good day.
I've been working on a little extension; the old trail exits the woods about 1/4 way up the hill, and the there is a deep gulley that makes putting trail in the woods impossible. A couple hundred feet up the hill, look for another single track on the left side; again, it's not easy, but it's not the boring ride up the ski hill. It should get a little easier as the tread gets compacted, it's still pretty loose now. That exits the woods again where we run out of woods between the ski hill and the fence; head up the ski hill, and look for another single track entrance, this time on the right. Much easier in this area. It is all two-way, so you can ride it down, but in my opinion it works better as a challenging climb.