Hi Adrian,
A couple of preliminary questions come to mind in order to better understand this park. Namely you want to assess the stability of the park in terms of resident demand, lot rent, POH rents, etc.
Q1. Is $500 lot rent, park owned home rent, or combination?
Some listings will say "average" but it's important break these out to understand park dynamics
Q2. What is the lot rent and POH rent at comparable parks (quality, amenities, and size)?
This is a very direct and crucial step in due diligence. Your rents in most cases will be determined by local demand/prices
Q3. What rents do 2br & 3br rents at apartments in the area rent for?
If your lot rent is $500 for say a double wide but 2br apartments are similar, your residents may have a logical preference for an apartment. Good rule of thumb is to find parks where local apartment rents are greater than 2x your rent. This supports the "affordable" housing argument.
Q4. What is the median home price in this metro area, county, city, zip?
With rates super low the argument can be made that if median home prices are in the $100-125k range, if a resident can afford a government mortgage program e.g FHA with ~4% down than a mortgage on house would compete with your park demand