Last year we stayed in the Grant Campground H loop, it was very nice, lots of pine trees and no bugs. Grant has no hookups but allows generator during some hours. You can look at a video overview of the campground at http://www.yellowstone.co/maps/grant.htm
2011 Flight 19BH, towed 10,000 miles so far.
1995 Suburban, 233000 miles towwing California to NovaScotia, Florida to Ontario and still running strong!