@tmperrault is technically correct as I too live in CA and purchase my first park outside of CA. I did not create a CA LLC right away, but eventually created an entity in CA as the “investment,” or “property management,” or whatever you want to call it. In CA you will have to pay a minimum annual fee of $800, but you can also create a Solo 401k to which you can contribute a minimum of $19,500 if you are under 50 years old, OR $26k if 50 and older. If you have a lot of extra income you can do an employer match into the $50k+ area. It is probably best to create the park LLC in the state in which you are purchasing the park using a registered agent such as: https://www.northwestregisteredagent.com/registered-agent/indiana.
I am just a CO and not a CPA, Attorney or anything else so you should always seek professional advice, but it will probably be close to this advice…Good Luck!