While you can feign ignorance on the parts that apply to the interstate rules (DOT licenses, etc...), the base CDL rules (including the medical card) apply to within California as well. In fact, California exceeds the Federal requirements for CDL drivers. The rules for the CDL, medical, and things like extinguishers and triangles are so pathetically basic, nobody is going to believe you didn't know you needed these things. I won't even move a U-Haul vehicle for my personal use without the latter.

