Its always been a Debate/Issue that you legally can’t make any stops when traveling from point A to B in California. In order to stay complaint with federal laws. Which may be true but…
The state of California specifically says “If you’re a citizen of the United States over the age of 18, legally able to carry a firearm by your state” and “Temporarily in the State of California” (Visiting). As long as it’s unloaded and in a locked container (Penal Code 25610: https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=PEN§ionNum=25610)
Which legally means, as long as your not a resident of the state, and temporarily visiting. Your legally able to travel through the state, with a firearm. As long as you make sure its just in a locked container, etc.
Open discussion… am I right?