The jewell campsites are closest to the AT, I dont have a distance. There is a stream that crosses the Jewell Trail right around treeline and actually ends up running down the trail. The AT and the Clay cutoff are above so treat the water.
The campsites on Jewell are just wide spots under a low softwood canopy, it would be tough to set up a normal two man but a one man minimal tent should fit. This site is very exposed to the prevailing westerly winds, if its gets nasty, you are going to wish you went down much further as you will probably be looking down on lightning. The area of the campsites is used frequently for a toilet as its the last open woods so watch your step.