What does he consider a substantial down payment and does he know that he has to pay capital gains on that down payment instead of just on the payments?

Mobile home park and house. 

You make more when it's uneven and you can live in the smaller unit.Focus on the asset and the area, as long as you can withstand net negative or breakeven cashflow, and you will gain in appreciation.

I expect a change in the White House and a better economy by summer 2025.

Quote from @Tamzen Tocher: Hello everyone,I’ve been interested in getting into real estate and doing lots of education and research.

Quote from @Gina Ventimiglia: Hello, I've been licensed for about 6 months And I have a $4.9 million home Florida for sale. 

If you want to manage STRs, start an STR management business and just do everything on the up and up.

I would reach out to any contact you have, such as realtors, property managers and ask for recommendations. 

Then buy your own, or turn that money into a 4-5 bedroom house and live there a year, and do it again.  5 years down the road you have 10-20% ownership perhaps in 2-3-4-5 RV parks and a couple houses. 

It is simpler and possibly faster to scale.