I intend to add a closet to the den and make it a 3 bedroom adding value as well as remodel the entire unit.

I do not know the market very well in Gatlinburg, but from a pure investment perspective (assuming revenue is gross) is abysmal. 

I would be happy to forward you the contacts of these folks so you can reach out, as well as a referral for a short term rental consultant who may have some insight.

With that said, I've done some research on the market and found the following information helpful in my considerations for Phoenix that you might find helpful as well:  Demand for both buying and renting property remains high due to the city's strong economy and growing population. 

That's great to see how well you've done.

I have run numbers for LTRs on a set of duplexes that seem to cash flow well.

I'm happy to be a resource as well.

There will always be upward pressure on rents there as well. 

:) Well, if the planes take off and land from east to west, buying a home that is north or south is not directly in the flight path. 

It sounds like you have a great background for investing as well as assisting other real estate investors in buying suitable real estate.