Work with the expert in this field who can guide you to structure the vehicle property so that you won't violate IRS rules and disqualify your IRA. 

Precisely.  

From early March through the summer, driving in California dropped over 60 percent, as measured by vehicle miles traveled.

These are investment vehicles like other investment classes so being emotionally attached to them can obscure our judgment.

Depending on that, I'm not sure what the discount would be in this instance but it may be comparable to a junior lien on a residential property, if not more favorable.Also something to keep in mind, these assets depreciate much more rapidly than a residential property, almost like a car would (since these are motor vehicle titles) which would effect the terms of the note.

This tenant has occupied the property for over 1 year so I sent them a notice to quit or vacate (within 30 days) for their violations- parking too many vehicles and subletting/unauthorized persons on October 31.

Post a sign that says 'Authorized Tenant Parking Only, all other vehicles will be crushed and cubed'

Seems to be positioning itself as an Airbnb without the fees and as a vehicle to facilitate direct booking.

I have been been debating a lot recently whether I should be putting money into other retirement vehicles such has a Roth IRA, 401k, mutual fund, index fund or should I be staying liquid saving my money to buy my first property?

Michael, it's precisely these issues that caused the last housing market crash.