Stiffknee is my favorite trail in the combined wilderness areas, precisely because it is one of the most remote.
Parking at Farr Gap is the most remote spot that can be driven to, the farthest location off pavement, at least on the TN side. Probably Wolf Laurel holds that distinction on the NC side.
35 years ago I spent countless hours studying forest service maps looking for the most remote spot I could find.
Farr Gap and Stiffknee trail have been my favorite place ever since.
To give you some idea of how much I like it,....I have asked that my ashes be scattered in the campsite about 1/4 mile down from the saddle where the trail turns right and drops down alongside Little Slickrock Creek. Over the years I have spent more time in that campsite than in any other, maybe even more than all other campsites combined.
Someday I will spend eternity there. It's MY spot.