You sound like a free-spirit and sounds like you want to travel and be unburdened....I like the RV idea, as well as the settling in Nashville eventually...

My question is can we create a LLC for her and Dscr refinance our current property into it to free up my dti?

You won't find a deal where you live for free, but if you can live in a great neighborhood at a reduced cost of living that is a nearly risk free way to get started in real estate. 

Feel free to connect, and best of luck

Free your day up for training in RE and getting real reps with sellers from the leads you're getting and really hone your craft.

Would a cash-out refinance to free up equity and keep growing be a smart move, or should I focus on paying down my existing debts?

Other good strategies, are targeting tired landlords (absentee, owned 10+ years) or drive around and find distressed properties, and call the owner from the records you find on TruePeopleSearch.comAnother method if you want to stay on market would be to send offers that are well under asking price for properties listed 60 days or more.  

So, I'd probably lean towards you staying where you are and look for rentals to buy with the $100k as a down payment.

That brings us to 2- the ability to negotiate to CREATE a good/great deal3- financial staying power (being able to survive when things go south)4 - property management 5- creativity 

The builders right now are also offering some very nice incentives, like rate buydowns and free property management. let me know if I can help in any way and best of luck.