If you would be embarrassed to explain before a judge and jury your actions, don't do them. 

The title would only be insurable after quiet title action.

The question is why develop a park when you can buy a functioning one for less $ per lot and with positive cash flow?

A complete, 100% plan covering all "what-ifs" must be written and vetted before taking action.  

I ran an initial estimate on a property, when I showed it to my contractor, before he went out to the property he thought the dollar amount and the scope looked good. After words, he came back with a bid that was abou...

I can put all of those to action and make decent money doing it.

Some help would be appreciated so I can plan and position myself!

This is important because, in theory, you are only buying homes that have positive cash flow.  

You tell them they must vacate and do no damage then you will not take legal action against them (I call this the easy option) and you will then either allow them to use their deposit against what they owe you and/or set up a "promissory note" payment plan - which is enforceable by law. 

Does anyone have any positive or negative experiences purchasing homes from an investment company which they rehab, screen tenants and property manage in another state?