The pickup trucks cruising down the boulevard with a couple of long guns in a rack in the rear window seem to have gone the way of the built in eight-track tape player. These days it's all about concealment.
In that regard, Guns.com has a great photo spread showing examples of firearms stored or hidden in vehicles. See Wanna hide a gun in your car? Here’s a few ideas (30 Photos). Some of the ideas are pretty good.
Some of them require a little bit of remodeling, but others are quite simple. My favorite is the handgun in a green holster that appears to be stuck to the carpet of the console wall. If it's Velcro then it's conveniently removable. The Ferrari logo on the steering wheel is a nice touch, too.
Then there's the semi-auto long barrel with short stock strapped to the back of the fold down back seat. Nice idea, although it might take a moment for the driver to retrieve it.
Lots of good ideas there. Check them out.
Meanwhile, it's good to remember that thieves love to rip off loose items from vehicles whether the doors are locked or not. Even if the property isn't in view it's vulnerable. I'm reminded of the tactic a friend uses. He keeps a cable lock in his vehicle, and whenever he has to leave a weapon in there he locks it to the structure under the seat. A dedicated burglar could eventually steal it, but the time it would take to defeat the cable lock should discourage the typical smash and grab offender.