I agree most of them have been conservative offers but not low balled any of them.

I agree with @Michael Pearse.

In the future I will have it spelled out in the contract the lessee agrees to take lien position behind any and all lenders. 

indeed agree 100%

I also do not agree with your solution, the problem is the dog, not the tenants, or the front door.

I think most of us can agree we're in the seller's market phase of this RE cycle but is this different than other phases in the past? 

I should add..there is a difference between simply requiring a notary signature (thus a 'mobile notary" can visit you on your mutually agreed time schedule) and a 'Loan signing agent' A mobile notary...simply visits and does notary services.

Getting answers to those questions will determine the amount of capital reserves you'll need to bring in addition to the down payment, but I'd guess at a minimum you'll need $15k, which drop your returns to the single digits until you can increase rents.I'm not 100% sure of the legality of the county's laws regarding sun setting lots, but you could reach out to the state's manufactured housing association and potentially get the two lots back if you agree to infill them with new units. 

I agree with @Chris Mason.

Would anything even show up if they’re from out of country and don’t have a SSN?