my next section is the smokies, and i understand i will need to make shelter reservations ahead of time. if i don't want to worry about all of the spots being taken, when (spring or fall months, preferably) should i plan to do this section? i did deep gap to fontana in mid-may this year, and that section wasn't too crowded. i like to meet other people on the trail, but i just don't want to have problems being able to reserve the shelters i want. thanks.