With a little ingenuity it always possible to stash a gun that's near to hand in a vehicle. If you are going to need it, then chances are you'll need it in a hurry, so it should be readily accessible.
But the option I prefer is to use a good outside crossdraw holster with no cant at the 9 or 10 o'clock position. This is my EDC mode. This carry mode is so much more utilitarian in all situations that I can't imagine why it is not more widely used. Whether in a vehicle, at a table or desk, or walking, the gun is readily available. Don Hume makes a dandy holster, the JIT model, which works great for either a strong side or crossdraw carry.