First, let me welcome you to the best flyfishing, flytying, fly anything web site going! Ask any questions you may have and I know someone will help you.
A 6 weight rod will handle the bass poppers and flies very well and you should have no problems. It will be a little "much" rod for the trout in the Smokies, but, if this is just a visit only, I see no reason to purchase another rod for trout since you have no trout in your area. If you do have the "bug" to purchase real bad, you could purchase a 4 or 5 weight which would make a good rod for trout and bluegill. A 6 weight rod will defeat a much larger fish than you may think it could. I started fly fishing about 12 years ago and have learned that a good fly rod will land any fish out there.
I am familiar with your area since I have relatives that live at "Land-A-Lakes" at Brooksville and more relatives at Lousiville.
Again, Welcome to FAOL
Warren
Fly fishing and fly tying are two things that I do, and when I am doing them, they are the only 2 things I think about. They clear my mind.