Some of those variables are the size of the park, number of vacant spaces, the number and type of park amenities, the age of the park, underground infrastructure age and condition, park location, size of the market, city water or well, city sewer or septic, other utility sources and whether or not they are direct billed, deferred maintenance, cost of management, and more.

Location, property layout and amenities are the key to determining how well your property will rent out and for what price.

The rent you can charge will depend on what others in the area are charging for rent (numbers) but also intangibles, such as condition, location, layout, amenities, etc. 

It's always price, amenities, and/or location - assuming a base line level of common sense listing like professional photos, accurate description, etc.

@Jillian Kitson @Nancy Bender Margaritaville and Reunion (and few condo resorts) all have rules about self managing and having access to amenities.

Does the home have amenities?

It seems like your property has a lot of potential, I would just be more thoughtful in your design and amenities you offer. 

I’m scouting neighborhoods with growth potential, good schools, and amenities.

Whenever I read someone say that these potential tenants are all unrealistic, they demand low prices or huge amenities, etc., it gives me pause.

Second, the brokers who perform these are often brokers with a lot of time on their hands, so the pool of brokers are the LEAST successful and newest brokersThird, the brokers are not educated in the proper METHODOLOGY to perform a valuation.Look, if you as a broker run some comps where the subject property is a SFR in a “cookie cutter” subdivision and the subjects age, style, amenities, condition, are similar to the comps being used, you’ve got a fair shot at a pretty accurate valuation.