Fourth: even if the entire deduction is available, it results in much smaller automobile deductions in future years and extra taxable income when you sell the vehicle or trade it in.

Not when there are so many alternative methods of engagement towards resolve of which past clients have appreciated.

If you want a lower downpayment way of investing without moving into the property, I recommend the BRRRR method. 

But it's just a trade off--no wrong answer.

So, some food for thought.Trusts seem to be the preferred method of liability and asset protection among the wealthy.  

Most service or trades people us included increase the rates for customers we don’t want.  

I remember seeing this method in many popular books and podcasts.However, the STR world has changed so much ever since with its exponential market growth.

Sharing our home a bit has been a small trade-off for living nearly mortgage-free while building wealth.

Often times when a builder/buyer moves too fast, or is too busy and overlooks a key piece of due diligence, the unethical ones will try the "scorched earth" method and blame everyone but themselves, even when they know it was their own mistake, and they'll see if they can scare you, the seller, the title company et al into paying damages/fixing their problem. 

Are there specific methods you're interested in (BRRRRs, vacation rentals, flips, etc)?