I'm no lawyer, so I give no advice. Simply copy/pasting what's on the web.
RV/Car Carry Without A Permit/License
724.4 Carrying Weapons.
1. Except as otherwise provided in this section, a person who goes armed with a dangerous weapon concealed on or about the person, or who, within the limits of any city, goes armed with a pistol or revolver, or any loaded firearm of any kind, whether concealed or not, or who knowingly carries or transports in a vehicle a pistol or revolver, commits an aggravated misdemeanor.
f. A person who for any lawful purpose carries or transports an unloaded pistol or revolver in a vehicle inside a closed and fastened container or securely wrapped package which is too large to be concealed on the person or inside a cargo or luggage compartment where the pistol or revolver will not be readily accessible to any person riding in the vehicle or common carrier.