You can get all the info you need about the park at the Park Service website for the GSMNP: http://www.nps.gov/grsm/ Pay attention to road closures and other weather info prior to your trip. (Overnight temp info is posted for LeConte and other locations in the park.) The trail map commonly available at sign-in points is posted as a PDF in the maps section and should be obtained. All the rules and reservation info are on the back of that as well.
I usually backpack in the Smokies, using shelters only when necessary. I'll file the reservation plans, and I'll use the hanging hardware to protect my gear...but I'll never willingly sleep in a shelter again. :-)
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