Contractors like what is being described are simply not going to pay double or triple because of financing. 

So at all times they have paid 30-60 days of rent. 2 evictions or more: NO GO unless they pre-pay the ENTIRE lease term, pay double or triple security deposit.

Lumber tripled in price.  

When I sold it, the price had almost tripled (yes it was~20 years that I had it).

Quote from @Ken Chud: This is a base hit type of strategy not a triple or home run each time.

In many markets, that model doubles or even triples the cash flow compared to a traditional lease.It does take more work up front—screening tenants individually, furnishing rooms, handling utilities, and creating clear house rules—but once systems are in place, it can be very steady income.

tldr - I recommend Batch DialerI've tried a ton of dialers, and I think Batch is the best triple line dialer out there.

The problem with Laredo right now is that the growth has doubled or tripled the capacity of the infrastructure. 

Recommend demanding the owner follow California laws regarding handling of security deposit charges & refund or threaten the owner with lawsuit - many states allow double or triple damages against landlords/PMCs that don't properly follow the laws.

You want to make sure you do all your due diligence in those 3 days, price for some unexpected expenses just in case, and triple check your numbers to make sure you didn't miss anything.