“Special purpose commercial modular” means a vehicle with or without motive power, designed and equipped for human occupancy for industrial, professional, or commercial purposes, which is not required to be moved under permit, and shall include a trailer coach. “Special purpose commercial coach” has the same meaning as “special purpose commercial modular” as that term is defined in this section.
Source:
Section 18012.5, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=HSC§ionNum=18012.5..