Good Ol' Boy,
If you want to carry a long gun in your vehicle, I've got no problem with it, it's your vehicle and your long gun. I'm a firm believer in being prepared but being realistic about it. Every time there is an active shooter incident in the news, someone, either here or in General Gun Discussions, brings up carrying a long gun in your vehicle as the solution to the problem. Often it becomes it's own thread.
You just need to be aware of the fact that a lot of guns are stolen from vehicles. Many of the crime guns used in St Louis, near where I live were stolen from vehicles as people leave their carry guns in their cars while going to sporting events like Cardinal Baseball games where carry is prohibited. So you are at risk of losing the gun every time you leave your vehicle unattended.
Then there is the chance that a self defense situation will present itself when you are in or at your vehicle. Yes, it can and has happened, but does that possibility outweigh the danger of having the gun stolen.
Guns are stolen from police vehicles all the time. I had a take home squad car, parked it in an outbuilding at the house when I was off duty. I still never left a weapon in the squad car, even though it was locked in my building.
Just some things to think about.