We could get some pretty good ball park numbers on what the refi would look like to help you make that decision.

I want to offer in the ball park of $370,00o to test waters have them meet me in the middle around 390,000 with a fixed rate 30 year 6.75%.

1 - Why is the rent lower than other units in the park?

Investors analyze income, costs, financing conditions, market rents, operating efficiency, and other dangers in order to assess cash flow potential.Increased revenue from tenants, extra sources such as laundry facilities, parking fees, and storage rents, as well as mortgage payments, property taxes, insurance, maintenance expenses, utilities, property management fees, vacancy allowance, and capital expenditures.

You mention mobile home(s)...perhaps implying this is a mobile park community?

One of the biggest is parking. 

I want the STR to be close to the main national parks and still on the fence weather it needs to be rural or closer a city.

Mobile  home park, yes.

There’s also new water park being built 5 minutes away.

@Andrew Balla I was just looking at some data this morning and 3 zip codes I've got my eye on are 28206 (+11.6% YoY), 28208 (+9.1% YoY), and 28215 (+6.9% YoY - particularly Shannon Woods and Windsor Park neighborhoods which border the 28205 zip code).