A close friend of mine in the banking industry has pointed out that I should open a line of credit using a recent appraisal of a property I had refinanced demonstrating considerable equity.

You would want to be able to demonstrate that your intent when you converted it to a rental was to hold it. 

Because it demonstrates financial irresponsibility (usually).

However, if you are going to add members so that it becomes a partnership for tax purposes you should wait long enough to demonstrate that you intended to acquire the property and hold for rental or investment purposes in your name of the single member and disregarded entity. 

Only what you can demonstrate for intent. 

Seek out markets that demonstrate population growth, job growth, and favorable average household income within a five-hour radius of your location.Now, here's a reality check: as investors, we must strike a balance between emotional attachments and data-driven decisions.

Do you have a track record to demonstrate your ability to do this "relatively" large deal?

Sounds like you can demonstrate financial hardship, so if you decide to go that route, stop making payments.  

- Lay out the conditions and get a "pre-buy in" on your offer.4 - I showed you screenshots of my lead campaigns, how I generated the leads, results from the campaigns, and how the leads were organized...I'm totally confused as to how you would miss this.5 - I went through an step by step list filtering demonstration and showed you how to get different leads than most people. 

Given the incredible earning potential the house has demonstrated, it isn't going to take that much to convince me to remove the listing and keep the house, so I look forward to hearing advice from non-local AirBnB owners/managers!