Its important to read the disclaimer at the bottom of the handbook which refers to the CA DMV handbook.
Now as lay persons we have no idea how the department will interpret/enforce a code. As others are saying the only folks that can help is the commercial enforcement folks as they have jurisdiction over all private or commercial vehicles on the road.
This number/names is about 5-6 years old but maybe it can lead you to those that can help.
Should you desire any further information, please contact Officer Ron Leimer, of my staff,
at (916) 445-1865. Sincerely,
S. B. DOWLING, Captain
Commercial Vehicle Section"