I did one mail drop on my thru attempt last year, at Fontana. The rumors of no resupply there were 100% incorrect when I got there, as every hiker food you could imagine or want was in stock. I had mailed enough to get me through the Smokies and when I opened the box, I realized that I didn't want half of it and the other half I didn't need as I had sent too much. When I try again, the only thing I will be mailing is gear to change from cold weather to warm weather and back again.