I keep a M&P 45, spare mags in a Console Vault. I drive a F150.
http://www.consolevault.com/gun-transporter.html. They are expensive, $210, but you get what you pay for.
I have one in the wife's car, she keeps a M&P9 and spare mags in it.
Under the back seat I have a lockable DuHa container. I keep a SBR AR15 and 8 Pmags in it. AR is in a gun sock with muzzle taped to keep dust and bugs out of the barrel.
http://www.du-ha.com/ford_f150_supercab_04_06.html
Texas extended "castle law" to private vehicles, and made it illegal for employers to ban guns from private vehicles in parking lot.
RFA