I drove it a number of years ago (man, maybe 20 now?) with a 27' Class C without issue. It was gravel then. But, that RV was my hunting rig and those roads were normal for me, so I was fine with it.
Edit - I just looked at Google Maps, Satellite View and zoomed in. Drop the little guy on the road for street view and County Rd 1/Trough Road is still gravel (at least at the image timeframe) on the east end, at least. In Street View, you can "drive" the whole thing on your computer to see what it looks like.
Edit 2 - I just did the above and interesting enough, as you head up the mountain near Gore Valley Overlook,
GoogleMapsSatellite it IS paved! How about that? ... and then it's gravel again on the west side ... so, the answer is "No, yes, no"
🙂
'07 Ram 2500 CTD 4x4 Quad Cab
'10 Keystone Laredo 245 5er