I can remember when high school kids had gun hooks on the inside window of their truck cabs-—and guns were there all day at school in deer hunting season.
Trucks were NOT locked up , either.
NO ONE every did any pilfering.
I can remember the same about the gun racks for rifles on the back window of the cab. Unfortunately today, even a bare car/truck is subject to a break-in by a Dindu Nuffin because they know they’ll be on the street in 3 hours tops.