Based on everything you said in your opening post above, the answer is simple, but...I will answer it with a story:Man goes into the Doctor's office. 

try http://www.cabinetgiant.comIF you've never done RTA (ready to assemble) its super simple.  

Hopefully the security deposit covered most of the damage (at least it’s a pretty cheap make ready. that’s really not a lot more than a simple repaint or recarpet  could run.) it’s mostly the missed rent and vacancy that’s a real killer. 

Simple as that!

Thats beyond a simple landlord/tenant dispute. 

Find out from the seller a few simple items to start, just to see if the deal is in the ballpark:Asking priceCurrent monthly lot rent $ amount Are any of the homes park owned rentals, or are all the homes owned by the residents?

There is much more to it than that, but that's a simple explanation.

This question is simple but has many rules.

Keep it simple and don't overthink things.

It is very simple, any change for additional work (labor and materials) requires a written change order signed (agreed to) by the owner.