There are many tax accountants on Bigger Pockets that can help you with your situation. 

Looking for various tax strategies to reduce the reality that a large RV or boat is a grossly depreciating assetI would not have a loan, so claiming it as a primary or secondary residence and claiming the mortgage deduction is not applicable.I sold my primary residence and I have several rental properties which I use as I'm fixing them up.What I'm pondering is living aboard and working aboard developing a new product, while traveling.  

@Nicole GrazianoI recommend that you have a consultation with a real estate tax accountant regarding your taxes.Bigger Pockets is a great place to find a real estate tax accountant. 

I have had my butt saved many times by attorneys and I am grateful for that.

Adding the ex to the title could trigger gift tax implications, so keeping it simple is best.

They lowered the “taxable value” by 40-50% and then raised the tax rate about 35-45% lowering everyone’s taxes that year.

if it is unsecured loan that is the consequence, you lose they entire thing. as far as tax write off, sorry but none.

Taxes and requirements should be much lower for a LTR

Anyone answering is not responding as a Tax accountant, Insurance expert or as a Financial advisor.  

Somebody bought that house at Tax Sale.