What other books does anyone suggest?

These course providers tend to sell their customer base on  unrealistic expectations or teach the most basic of concepts which are easily picked up through a book or merely browsing through these forums.  

Does anyone recommend knowledge sources on building a mobile home parks (websites, books, organizations, plans, etc..). 

If you sell the property, a lot of the $107K cost will be eaten up in transaction cost.

Most of the time a newer or unsuccessful agents will host open houses as they build their book of business.

Tools like the BiggerPockets calculator and books like The House Hacking Strategy can guide you further.

With EPIC theme park opening in a few months, this area is seeing bookings pick up, but it is a very competitive and crowded market.

Congratulations on your impressive success since 2021—that's quite an achievement to have closed over 100 transactions in such a short time.

AirDNA only know whether a night is open or booked. 

There is a BP book by Heather Blankenship that would be a good place to start - Real Estate Campgrounds.