To properly value a park requires a fairly deep understanding of how they will operate, given all the potential variables.

Someone self-managing and DIYing the design/furnishing has the potential to see the higher end of the return assuming they are a good operator; while someone who outsources the design/furnishing and management will of course see the lower end of the return as they aren't putting nearly the same amount of time into it. 

Depending on your future lender (assuming you are buying more than just one property) some required multiple years of the business operating before that income can be credited towards your income, others will credit the income the property gets at a discount (70% of the rental take, the day the property was bought.)Now for stuff I don't have personal experience with, yet.1.

We manage a little over 400 properties that we own and operate in NYC, NJ, CT and Philly. 

Since Charter operates in my space, seller financed notes, I run into Charter students every now and then.The crux of their program is to teach you to find notes for them.

If you do go with an LLC, make sure an attorney provides it specific to you (not downloaded from the internet), that teh attorney will defend it in court, that you jave an operatiing agreement and that you follow said operating agreement. 

With the current market, I will not be able to make my required cash flow after paying all operating cost including mortgage, vacancy, property tax, insurances, maintenance cost, no need for a property manager because I can manage it.

Since the OP specifically mentioned that she will be operating her MTR in Gainesville, GA, she needs to be aware that there is an ordinance limiting all rentals to 16 days or greater.

I know STR operators are having a hard time with the regulations.

Many states operate under Caveat Emptor and have no disclosure requirements.2) These are probably not latent, or hidden, as a most jurisdictions have online permit and violation searches you can conduct.