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

According to what I have read straight from the IRS website and other places, we need to either meet 500 hours, or at least 100 hours and also work more than anyone else on the property.

“Does anyone know of a website or resource that reviews Real Estate Syndication sponsors or offerings?

I have looked on the Arizona real estate website and all I could find was the addendum, I would really appreciate if someone here already has that contract and is willing to share it with me that would be great.

Things like a website, an email at your domain and credible social accounts (even small things like a profile pic and bio) can show you are a legitimate business.

I keep finding conflicting information and the IRS website doesn't specifically mention using an RV as a STR.

Lancaster city limits short term rentals to only certain zones of the city so definitely look at the city website for that information.

Due to the nature of the shorter lease terms, I am spending an excessive amount of time updating my Excel spreadsheet, MLS, business website, Airbnb, VRBO, and other platforms.

Do you know of any good websites where I can post my deals?

I do direct booking through the Houfy website, taking credit card payment by Square.