. - I have no idea if I could transfer my Starlink RV account to a residential one when the time comes.

If you sold it, could you transfer the mortgage to another place without a job? 

I am just over a year of ownership for the property and things are going well.

A title transfer would likely trigger an immediate default/foreclosure.

You are transferring basis, so there is less depreciation to claim on every new purchase.

I really enjoyed Traction, the 4 Hour Work Week, Millionare Real Estate Investor, Extreme Ownership, The 10X Rule, Make your Bed and I reread my books frequently.

But I believe this is a solution to create equity ownership and basis in the deal for a non-cash partner. 

The issue is that I am planning to buy the property under a new single-member LLC that would also be treated as a disregarded entity for tax purposes (let's call the new one Wall Street LLC).If the ownership of Wall Street LLC and Main Street LLC are exactly the same (both 100% owned by me, the sole member), does the sheer use of two different LLCs risk triggering any tax obligations or breaching the 1031 code?

In this case the owner is willing to transfer the property to me via my LLC if that is best.The owner has no problem with receiving their money after the fix/Rehab has been done in the property has been refinanced or sold.

Take ownership of your mistake and learn to do the proper due diligence recommended above😊