If these lines are unsecured by the property then it's a little different than the typical lender/rehabber type loans out there. 

So far, I plan to create an LLC in Rhode Island, open a business account and a business line of credit, have all the earning and bills from the short term rentals go into said account, and have the LLC sign a lease on each of our properties (which my wife and I will own under our name) and then transfer the earning after expenses from the LLC over to our personal bank account.

I may go the route of having an unrelated party make the purchase via hard money, and purchase it from them a few months down the line, via a conventional 1031. 

You could still follow through if you have another job lined up and document, but otherwise you're looking at hard money, and you may have some difficulty finding a hard money lender who will lend to you without a job - but again I don't know your financial situation. 

Bottom line is make sure you study your lease very carefully as there are no “rules” when it comes to commercial leases.

We have built business credit through Unsecured working capital such as a business  credit cards, lines of credit, and small business loans. 

Home equity lines of credit and credit cards.

I haven’t finished a deal but I’ve been doing deals are looking for deals and then I realize that I have connections with a group of the communities that not many people have connections in and I noticed that they want to sell the property and I have another line of connections that are investors and these investors are pretty much looking to buy every property and they can get their hands on so hopefully soon as I get this property under contract then I’ll finish my wholesale deal for the first one he just got a find your your connection that you have and not anybody else has

You aren't getting that on line.

@Benjamin Piecenski If I put all three properties under an LLC, can I use the equity to get a line of credit to avoid all the appraisals, environmental, & cost of refinancing each house?