Know this one is to the southeast of Philly, but it might suit your needs. It used to be Timberline CG but has just joined the KOA group with new ownership. Significant construction going on to upgrade, update and expand. Older sites are typical of many privately owned CGs in Northeast - narrow, tightly packed with narrow interior roads. New sites have addressed this problem. There is public transportation into Philly available for around $6 Round trip. Been there once before the changes. May be the closest (convenient) CG to Philly. http://www.rvparkreviews.com/regions/new-jersey/clarksboro/philadelphia-south-koa-formerly-timberlane-campground-4201