Call the local
planning and zoning department to find out land
usage laws.....If zoned as Single or Multi family normally requires a permanent foundation per local code and permits. Mobile or RVs are usually illegal on these lots and are only allowed in designated areas, however, with the new tiny house demands zoning codes are being re-written, again ask call the AHJ (Authority Having Jurisdictions) ....to see if any changes are in the works.
Some have online
portals with maps that show zoning, set backs, utility easements, making it easier to shop for land. Ask the AHJ.
That is one of the most dominating areas in the USA for earth construction, all kinds of great codes and experience/trades....one could build on a perm foundation and sell
easy if located & done right.
Most times I roll through there with my 48' toy hauler on route 66 I break down don't ask me why
Recently made it to CA looking at alot
of earth builds while here.