It all depends on the current physical and financial state of the park and what makes sense. 

One of the folks got financing with Penn Financial.

At the same time, real estate has been overlooked by many traditional financial planners, who don't understand it or haven't been trained in it.

American workers are financial slaves and our education system, political system, media, financial regulatory system, tax system and financial system pretty much ensures that this will not be changing.George Carlin on the “American Dream”https://youtu.be/kJ4SSvVbhLw

The best answers for you will depend on your personal financial situation: how much you are looking to put in, how much risk you are willing to take with the money, etc..

Absentee (if your area isn't over-run with investors sending to these guys), Seniors, Financially Unstable...

What financials does the bank need?

While simultaneously building our real estate portfolio so that my brother and I can be financially free and give our families the time they truly deserve. 

Besides my full time job as an Electrical Engineer I want to build a long time portfolio for financial freedom and satisfying my entrepreneurial soul.

Worst case, you spend $400 and avoid a disaster; best case, you spend $400 and come up with some stuff that's not too important but that you can use to beat down the price.