Check out the STR forum where you'll find some great information and will see questions and answers from those who have successfully scaled STR businesses. 

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

Question is: how? 

They are inherently riskier loans so it takes a baseline level of trust, or legal protections, to ensure that the Gap lender in question is protected because being in subordinate position on title means that if it gets sold for less (via bankruptcy or any number of proceedings), you are more likely to lose your money.You also need to make sure that your primary mortgage holder on the deal is okay with there being a Gap funder.

I have not heard of them, but I would make sure, especially since they seem to be a new player in the space, to ask them the questions that are outlined on the "Best Questions to ask your DSCR lender for STRs" post on this forum: https://www.biggerpockets.com/...

Great question and I completely get the appeal of wanting to prioritize portfolio cashflow once your paychecks stop.

Happy to answer any other questions you have. 

I've been investing and hanging out on BP for close to a decade now, so please feel free to reach out with questions.

That likely means that they are not good with money management which you are likely expecting from him.To answer your question, if you are doing long-term rentals, the LLC taxed as a partnership is likely the go to route.Best of luck.  

My question: Through your own lived experience or knowledge of others, what are the most useful graduate degrees when it comes to real estate investing?