You can obviously modify it to ask for make and model of vehicles. 

As a landlord, should I request the current tenant, without violating the law, to update me annually with new personal information like new owned vehicles license plates (when tenants changed their cars), changes of employment, emergency contacts, or someone on the lease turns 18, etc.?

Lets partner up to allow my success be your "good stewardship" and vehicle for more cash-flow!

Drive through the parking lots in the evening and look for company vehicles. 

Become good at finding deals: with good margins (just because it is off market does not make it a good deal). splitting the deal: meaning splitting profits (rental or flips) but in this case bc you lack the funds : flipping just acts as a vehicle to acquire more funds and then do what you want: which is buy rentals. 

The motors were expensive to maintain and while someone might want to live on it, it's very small.  

One of the units will be paying to run the furnace motor.

I do not believe he is isolating, as I went there two days in a row (one time to do some landscape debris cleanup, another time I had to service an adjacent apartment with a bad window operator) and both times his vehicle was not in the parking lot.I am also not sure about informing others. 

Set policies, put them in writing, commit them to memory, and do not waive them:All adults must pass your screening;Nobody moves in without proof utility accounts are established, rent and deposit are paid in full;Rent is due on or before the 1st, period.Late fee is applied on day X, period.3-day Notice to Pay or Quit is filed on day X, period.Eviction filing (forcible entry and detainer) is filed on day X, period.Be prepared to handle lease violations (unauthorized pets or tenants, vehicle parked on lawn, not mowing grass, etc.)A little education and preparation will go a long way.

Not trying to start a old car competition, but 2 yrs ago we got a 87 Nissan for $400, had to put $500 into it, runs amazing and is our primary work truck, if you're trying to do renovations.. that'd be your ideal vehicle IMO!