My first question would be:  is this one-level living? 

The homes will simply be older, the land obviously the same size, however the revenue may have gone down by half if you decide to sell these properties and simply collect lot rent, which may cut your gross income in half.There is definitely a lot more to consider that I am not including in this quick comment, however in my opinion this park may not be the best use of your time, energy, and capital.. at it's current price.

@Chaim Kernkraut, your experience, comfort level, and risk acceptance will determine the answer to the question. 

Decor upgrades, the addition of private hot tubs, and a fenced in yard for dogs have all added to the marketability and the occupancy level of the property.

The two compliment each other because the brokerage side brings in much of the profit while the PM side levels out some of the volatility of operating a brokerage and also generates leads by providing access to a client base of investors using the PM service who are likely to buy and sell through the brokerage.

Their rates are typically high (12% or higher) depending on where you live, they will charge points, and your rate will largely be determined by your level of experience and how much money you contribute to the project personally.I'll let others with more experience chime in on this.

It is a crime and doing so warrants very serious criminal charges being brought against you on federal, state, and/or local levels.

I have used portable stand alone units (per room or level basis) and I think you can get whole house units as part of HVAC systems 

So..the floor is not "subfloor" level.  

Finally, you are the only person that can determine the level of risk you can take.