Honestly if Hunting or sports shooting is ones main hobbies. Then it is never worth keeping one in the car or truck. One careless storage charge, and you lose the guns, the ammunition, your bows, knives/bush crafting tools like machete's or hatchets. A weapons ban due to careless storage is multiple years of never being allowed to do the hobby of hunting or sports shooting. If anyone plans on actually keeping a truck or car gun behind the seat or in the trunk. I highly recommend having insurance, through one of the main Firearms orgs, so that you can call on their lawyers when the cops decide that they know the law, but if not the judge will figure it out. There was a guy on here who tried to represent himself, lost literally all his firearms even though he followed the law to the letter. Never represent yourself, all ways get a lawyer. And the CCFR and NFA can help with that, if one would of purchased the appropriate memberships.
If anything we should be discouraging people from this style of storage/transportation. It's too risky, and can lead to bad public perception of the sport and those who hold licenses. I do understand there may be a bit of a rural and non rural divide on this idea. I do recognize instances where if really rural, keeping one in the car makes sense. But the cops in those areas are probably more used to this as a concept and most likely know firearms law a bit better then a small city, or town cop (I'm thinking like Brockville, or kingston as small city/town) For sure a city cop will not understand and charge you simply for having it in the window.
Also modern cars are not secure. All it takes these days for a large swath of modern vehicles to be stolen is some cheap computer tech. They take your car without a key, and it's just gone. No longer would I consider a modern truck, or car, or SUV as a secure locked compartment when literally any sufficiently intelligent group of thieves can now just walk up, open and drive away with your vehicle at a few clicks of their techs buttons. Actually I could see a judge depending on the make and model, making this exact same argument to prove your not following proper storage laws. Remember, a guy got charged with careless storage even though it took a group of thieves a whole weekend to break into his literal vault because he should of known it was an area known for break ins. Judges suck, police suck. Protect yourself by not leaving guns in the car.