I can recall 3 or 4 stories in the last year or so of people having NDs while handling a firearm inside a vehicle. Generally speaking, I’d have to say it’s bad practice to be manipulating a firearm within the confines of a vehicle.
my suspicion is that they were “hunting” from the front seat of the truck...
which was probably a factor with most “accidental” rifle fire inside a vehicle. (although one can never discount stupidity)