“Thus far I have been lucky”
For years I had this large plastic tote in the back of my pickup. Firewood, axe, stove, mat,… nothing of much value. After many nights at trailheads, no one even took the lid off to see what was inside. I considered it an experiment to see if anyone bothered it.
I think trailheads are pretty safe in general. Our phobia of someone breaking into our cars is mostly unfounded.
When reading headlines about how terrible things are, take it with a grain of salt.
I just park my car, lock it, nothing visible, then don’t worry about it. The value of hiking exceeds any small risk of car damage.