I think I know the answer but wanted to verify with more experienced investors.   

Verify this information with a local broker or appraiser for extra protection.

The first ledger showed blank months, but when I asked them to verify again, all rents were paid on time. 

What if you took each one of these properties and put on 50% leverage and bought an identical set of properties.  

What documents do they require, what credit scores do they allow, how do they verify previous rental history, etc.?

It is also important to verify that connections to the posts are adequate for the required loading as member failure is not a catastrophic as connection failure. 

What documents do they require, what credit scores do they allow, how do they verify previous rental history, etc.?

@Jay Hinrichs, the bidding service you mentioned sounds exactly like what Heaton Dainard, Caliber and Vestus are doing in western WA.They drive the properties going up for auction that week, eyeball rehab, verify comps, bid for clients.

It should be equal to what is paid at hotels and is seemingly in line with what I have seen across the country I want to verify what Airbnb told me here, and ask what other Allegheny County investors have experienced regarding this.

Folks, please do your due diligence and DO NOT trust... until you verify.