Two codes to go by and possibly even print up to bring with you when you do the inspection are:
V C Section 362 House Car http://www.dmv.ca.gov/pubs/vctop/d01/vc362.htm
362. A "house car" is a motor vehicle originally designed, or permanently altered, and equipped for human habitation, or to which a camper has been permanently attached. A motor vehicle to which a camper has been temporarily attached is not a house car except that, for the purposes of Division 11 (commencing with Section 21000) and Division 12 (commencing with Section 24000), a motor vehicle equipped with a camper having an axle that is designed to support a portion of the weight of the camper unit shall be considered a three-axle house car regardless of the method of attachment or manner of registration. A house car shall not be deemed to be a motortruck.
Amended Ch. 875, Stats. 1968. Effective November 13, 1968.
Health and Safety Code Section 18010 Recreational Vehicle Manufactured Home Mobilehome Commercial Coach Truck Camper or Floating Home http://www.dmv.ca.gov/pubs/vctop/app...af/hs18010.htm
Recreational Vehicle, Manufactured Home, Mobilehome, Commercial Coach, Truck Camper, or Floating Home
18010. "Recreational vehicle" means both of the following:
(a) A motor home, travel trailer, truck camper, or camping trailer, with or without motive power, designed for human habitation for recreational, emergency, or other occupancy, that meets all of the following criteria:
(1) It contains less than 320 square feet of internal living room area, excluding builtin equipment, including, but not limited to, wardrobe, closets, cabinets, kitchen units or fixtures, and bath or toilet rooms.
(2) It contains 400 square feet or less of gross area measured at maximum horizontal projections.
(3) It is built on a single chassis.
(4) It is either self-propelled, truck-mounted, or permanently towable on the highways without a permit.
(b) A park trailer, as defined in Section 18009.3.
(Amended Sec. 2, Ch. 566, Stats. 2000. Effective January 1, 2001.)
I'd recommend maybe going to Morgan Hill or Gilroy DMV or the closest to those cities. They're more likely to see stuff rolling up to their inspection lines that they'd probably flat out reject in an office say in Los Gatos.
I took ours to the local office and got referred to the CHP of all places. The CHP said they inspect busses, but not in that way. Just to make sure the commercial codes are being enforced.
I was told to maybe try Lodi who is used to seeing tractors and all kinds of other non run of the mill stuff and was out of there in about 30 minutes. Most of that was waiting for the people in front of me to get finished with their inspections. The inspector was very nice to boot. Very different from the local office.
Hope this helps,