I assume that DD means darling daughter. I can think of 5 campgrounds in that area besides Jellystone:
http://dnr2.maryland.gov/publiclands/Pages/western/cunningham.aspx
http://dnr2.maryland.gov/publiclands/Pages/western/gambrill.aspx
http://dnr2.maryland.gov/publiclands/Pages/western/greenbrier.aspx
http://koa.com/campgrounds/hagerstown/
http://oleminkfarm.com/index.html
2006 Four Winds Majestic 23A