CA.......
Before crossing into CA place your EMPTY/unloaded firearm(s) in a separate locked compartment and the ammo for firearm(s) in a different compartment
Load and have handy at your own legal risk.
Having been a citizen of CA for 30+ years I have always 'skirted' the CA gun laws.
My personal choice and fully understood the legal consequences.
BUT I choose to deal with the legal issues vs having my loved ones hurt/killed by some low-life
Still carry ready when going across CA State lines.....but I do NOT 'advertise' I have weapons.
Know the LAWS and then decide ----personal decisions