I had no problem with the gravel roads in the Cherokee Natl. Forest last month when 8 vandwellers got together at tumbling creek campground. I did have to go slow, and if your gps relies on cell signal ( smart or not so smart phone) you might be s-o-l. There were 2 astro vans, an 80's extended dodge hightop aero, a pleasureway class b , a converted airporter transport,an e250, a Toyota corrola and my bus, only one astro of which was
AWD. I'm sure there are areas that are even more off the beaten path then we were, but most service roads appeared to be graded gravel. The other Natl forest campground in north Ga( chickamunga? Nf) Hickey Gap was 10 miles from a paved road and 2wd was fine, even after a rain.(gravel road had washouts, but was passable at 10-15mph)
Les