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We have parked our 36 footer in several and expect no problems with the 40 footer we just bought, either.
Some examples: Cherry Hill in Winchester, Claytor Lake State Park on I81, Luray RV Resort, Bethpage Camp Resort and the Virginia Beach KOA come readily to mind.
Aquia Pines near Stafford, VA can easily handle 40'. Unless you want to tour DC or George Washington's stomping grounds there's not much reason to go there. We do because our son lives in Stafford. It's also $50/night! Touring DC is better from Cherry Hill.