Ask your question to Sgt Rock at
http://www.whiteblaze.net/forum/? He maintains a section of the BMT. He did the BMT instead of the AT section from Springer to Davenport about a year ago when he tried to thru hike the AT. Sgt Rock runs the white blaze site.
Check at the bottom of the referenced forum for a list of other long trails. The BMT is listed and there are some rerlatively recent posts about the trail. They might give you what your are looking for. Stay warm and stead on your feet.