If it was me and I was leaving the camper at COSBY and just driving my Truck I would just go thru Gatlinburg into the Smoky Mtn Park and head for Townsend, Marysville, and pick up I75 at Lenoir City. Then head on into Chattanooga...
I'm sort of partial of any driving thru the Natl Park... Its magic in there with its close ties with the Cherokee Nation.
Of course I would most likely be staying in Townsend or at the ELKMONT Camp in the Smoky Natl Park anyway... Townsend has several full hookups but the Natl Park has no hookups. Water is available at the toilet buildings but no other services available. We also like staying on the creek side camp sites...
Cosby is ok and has a few camp ground on the road to Gatlinburg but Townsend to us is more central located to feed both Gatlinburg and Pigeon Forge and still be staying away from the wild and furious activities of both towns. It never stops there haha... Too many peoples for us haha...
You might want to check out Townsend for future returns to the area if more peace and quiet is what you may to be looking for.
Just my thoughts - we love the Gatlinburg area and usually go there twice a year maybe more... Have tent camped at The Cosby Camp inside the Natl Park a few times. Have also stayed at the Arrow Creek Camp at Cosby...
Roy Ken
My Posts are IMHO based on my experiences - Words in CAPS does not mean I am shouting
Roy - Carolyn
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