This is a matter for negotiation between the parties.  

Cashiers checks are still alive and well, and many people still use them, thinking they are making the other party comfortable.  

It also makes it easier when treading in a transaction where I am representing both parties. 

(and for the sake of argument, lets just say I can get it from the motivated seller for what ever price) This is the part I struggle with in regards to rentals because I believe I have grossly underbid some motivated sellers using the rehab formula to make my offers (65% of ARV minus repairs)

@Drew Feinis correct that a few details are needed - and possibly a few steps to notify the party of what you are about to do, why, and how to prevent it.

If they get 3rd party financing (can be hard to do with MH), you could use that cash influx to purchase more Mobiles and do improvements to the land.  

The experience you will gain is worth much more than the money part.  I

Where I see projects fail is when owners don't listen to the paid expert party where the owner thinks they know better that the professional they hired. 

Most rentals with higher perceived risk can be offset by requiring an excess security deposit and/or a third-party guarantor for the lease, and/or prepayment of rent. 

As for now all costs have not been settled, but neither party are taking blame.