You will be off the beaten path with your choice of CG. Height clearance all depends on TN DOT maintenance cutting the trees. Your best bet is to call TN DOT at 615.741.2848.
Look Rock may be one of the first come first served CGs. Call the GSMNP ranger station for information about getting a site. Their number is 877- 444-6777.
If you have your heart set on this CG, the chances you'll take may be worth it. For me, I'd find a CG more in the mainstream and drive to the GSMNP for recreation.
If you are looking for a RV resort with peace and quite yet only a mile from the Parkway in Sevierville, consider The Dell at About the Dell