Others are a hospital and the city and county (including school systems), so there are a lot of permanent residents too, but renting is probably the best way for an investor to go.

That'll have a little impact on value for sure.

If it does not a carbon filter will remove all traces permanently and will need serviced roughly every 3 years.

Do you reflect on the impact of your real estate investing in others?

You might want to see how 200 homes impacts the market before committing to a large scale infrastructure project that a mobile home park would require. 

I don't know how it would impact your credit score but it could/would impact your DTI (debt-to-income) ratio.  

Apart from the ARV analysis already done here, you seem to be missing a few expenses that will impact your cash flow.  

You will likely need to find a private lender to fund this deal.Also, since the property is vacant and not producing income, you will not qualify for permanent financing.

If this is your first investment property and your debt to income ratio would be substantially impacted from getting a mortgage, perhaps you ought to keep it free and clear while you get the hang of managing it.

We have found that reducing rent doesn't usually impact the length of the stay.