Check out this group, Loners On Wheels. My wife and I ran into this group about 10 years ago while attending a bluegrass festival (in mid-Michigan). There were quite a few of them and they seemed to have a good time. I spoke with one of the men and he told me that he had traveled from Texas with his new 5th wheel and hooked up with the LOWs from time to time depending upon where they had established a meet.
http://lonersonwheels.com/