If you would like your tiny house to be in an RV park in California, your tiny house must meet ANSI 119.2 or 119.5:

“A recreational vehicle that does not bear a label, an
insignia, or an insignia of approval, as required by subdivision (f)
or (g) of Section 18027.3, may not occupy any lot in a park unless
the vehicle owner provides reasonable proof of compliance with ANSI Standard No. A119.2 or A119.5 depending upon whether it is a recreational vehicle or park trailer.”

Here’s the regulation: http://www.leginfo.ca.gov/cgi-bin/displaycode?section=hsc&group=18001-19000&file=18871-18871.11&hc_location=ufi

For information about ANSI inspection, see https://americantinyhouseassociation.org/construction-guidelines/