Way too much fear of the police here..... The statute deals with weapons in a MV, and the list of those is long, to include martial arts weapons, knives, brass knuckles, etc... not just guns. As long as you are the permit holder, and it is your vehicle, you are good to go to leave it in the car. Just use common sense..... leaving it in the car, exposed, in a bad area of a large crime infested city may get you jammed up if its stolen..... a reckless endangerment charge, or such. I have never arrested a permit holder for weapon in a MV, just cause he didnt have his loaded firearm on his person.
"One of the common failings among honorable people is a failure to appreciate how thoroughly dishonorable some other people are, and how dangerous it is to trust them." Thomas Sowell