Appalachian Trail: Pine Knob to Pen Mar County Park is a 17 mile point-to-point trail located near Chambersburg, PA. The trail is rated as moderate and primarily used for hiking, trail running, and backpacking.
We broke this hike into two sections: from Route 40/I-70 parking lot (not far from Pine Knob) to Wolfsville Road (8.8 miles), and from Wolfsville Road to Penn Mar Park (10.5 miles), and covered the entire distance on two different Saturdays. There is a small gravel parking lot off Wolfsville Road (google address: 11359 Wolfsville Road, Smithsburg, MD) that could take at least 8 cars.
Highly recommend this hike.