I found the reg under the Rules and Regulation for the GSMNP. Section 1.5(a)(2). Says Hazel, Noland (only up to cs#64 only 4 miles up) and Forney(only up to cs#74 which is at the mouth). So with the exception of Noland and only at the mouth of Forney, they are not allowed except anywhere on Hazel. Also, it gave a maximun LH and W requirement which is 48"L,24"W and 18"H.
Thanks Mr. Casada I learned something today.