"Ridgerunner" is a nickname for people from the higher parts of mountainous areas in the Southeastern United States, especially the Appalachians.
In this particular sense, a Ridgerunner meets, greets and guides hikers, as well as providing brochures and literature to inform visitors about the trail.
They take steps to encourage the best behavior on the part of hikers, to facilitate a positive experience (particularly for those who are poorly prepared), and to elicit the support of Trail neighbors and those who live nearby, but who may not understand or use the Trail properly.
Ridgerunners, by their presence, discourage and mitigate misuse of the Appalachian Trail and its environs by performing educational and public relations functions.
They were said to "run the ridges" with their illicit cargo to bypass the roads down in the hollows where law enforcement officers might find them.