The closest tracks to Annville, PA are probably Pit Stop Hobbies (Mount Joy, PA) and Bumps and Jumps (Etters, PA). Pit Stop is an outdoor track and runs in spring/summer/fall (usually Friday nights), while Bumps and Jumps is an indoor track that runs in the winter. These are both 10th scale tracks and 2wd mod buggy and 4wd buggy are probably the most popular classes with some short course classes also.
If you dont mind a 60-90 minute drive there are a bunch of 8th scale offroad tracks around this area. LCRC is about an hour away, and is the nicest facility on the east coast. They are hosting the 8th scale electric nationals this year, as they did in 2013. They even had the 8th scale nitro nationals in 2012, so it's obviously a top notch track. Other than LCRC there is Trains and Lanes in Easton, PA, Hobby Hut in Audubon, PA, G's in Shippensburg, PA and Mushroom Bowl in Kennett Square, PA. There are 8th scale tracks at each of these places and the biggest classes are 8th scale nitro buggy and electric buggy. They also have regular turnouts for 8th scale nitro truggy and the electric truggy class has also grown a lot this year.
Hope this information helps you out...They all have threads in the racing forum if you need more info.