In the past, I've received 20-50 inquiries and maybe 10 parties show up at the open house with 3-4 actually submitting an application. 

When we asked him for these documents, he even said that in 40 years he never deposited any rent money in bank (I think its the norm with mom and pop mobile home owners).

But you should be able to see from your survey showing the easement where it is recorded and go to the county clerk's website and download the original easement document.

There are portfolio lenders out there that will finance a 2-4 unit with 15% down payment depending on credit score, income documentation, etc.

So I requested my property manager to forward me all the lease agreement documents and she basically lied and does not match with her company's lease requirements. 

I wish they provided my accurate financial documents.  

I'm looking for a lender that is investor friendly and will not require a bazillion documents. 

If they cannot explain the fees, or if it takes more than 24 hours for them to turn around a loan estimate (after you've given them the necessary documentation) those are both easy red flags imo as to their responsiveness and competence. 

They even include documents and spreadsheets but most of it locked.

The question is was this issue addressed at closing with a seller escrow (if so, submit the bill to the title company) or do you need to pursue them directly for payment?