Regardless of the response you got from caltrans, it is not correct or complete. Caltrans is in charge of building the roads and engineering infrastructure. They have nothing to do with making or enforcing licensing or vehicle registration. Same with dmv. The chp is the one which interprets and enforces the laws. I can't source the section off hand but I know there are a lot of three axle motorhomes, over 26,000, driven by people with a regular class c license in California. Maybe someone else can help with the code section which allows it.
As far as being over length and concerned with not being in a truck route which allows it, there are always exemptions which allow direct access to any road not on a truck route. Think of any time someone wants to move. All the residential streets here have signs that say no trucks over 5 tons or something in that range. When someone want's to move they don't have to get a pickup truck to shuttle all their belongings to the edge of town to load into a 80,000 pound moving van. The van is allowed to take the most expedient route directly to and from it's destination. The same with garbage trucks. They don't need a special permit for each trip they make off the truck route. The same rules apply to a motor home regardless of the size. You are not allowed to use the smaller roads just to travel through but if your destination is along that road then you are allowed to get there. This logic does not apply to hard limits like bridge weight limits or height limits. There are also some area which have parking regulations related to height or length.
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