My Posts are IMHO based on my experiences - PM me Roy and Carolyn
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There are a lot of campgrounds in Gettysburg PA which is >20 miles north of Thurmont. I don't believe that either Cunningham Falls or Catoctin Mountain Park have RV sites. There are also campgrounds in Hagerstown MD which is accessible to Thurmont via MD77.
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There is really nothing very close to Thurmont or Emmitsburg. Avoid driving through Catoctin Mountain Park with an RV or TT - some of the roads are tight and along the edge of drop offs. The nearest cluster of campgrounds - and really not so far away is Gettysburg and there you will have several to choose from. Check RVparkreviews.com for reviews on all of them. Because of the popularity of Gettysburg you should make advanced reservations.
Catoctin has RV sites but they used to be dry and small.Haven't been there for years. Cunningham Falls has electric and water. You could call them. There is no good way to get from Hagerstown to Thurmont. If you don't want the state park better to stay in Gettysburg.There is a small campground along the creek about a mile from center Thurmont but I can't remember the name and it doesn't appear to be in the directories.
Avoid driving through Catoctin Mountain Park with an RV or TT - some of the roads are tight and along the edge of drop offs.
Although you may choose not to drive your RV on MD77 through Catoctin Mountain Park because it is a bit windy, it is an excellent road; my DW commuted on it for years. It happens to be the access road for the President's Camp David retreat. You can imagine this means it is well maintained all year round.
So if you choose to camp at the Jellystone or KOA parks in Hagerstown, MD77 provides a perfectly fine way to cross the mountains to get back and forth. Alternatively, the Gettysburg parks are 15 minutes up US15 which is a 4-lane divided roadway.
These comments are based on 8 years of living in Thurmont.
Cunningham State Park I heard is very nice. Yogi Bear in Hagerstown is very nice but $$$$.
Cunningham Falls has 41 sites with electricity; I believe they are all considered tenting sites. The park website says they are 23x23 which makes them a bit of a problem for most RV's.
Our favorite campground when we go back to visit family is Drummer Boy in Gettysburg. It is definitely cheaper than the Jellystone and KOA in Hagerstown. The KOA in Gettysburg is "tight" as is Roundtoup.