[Greysard]

And you’ll never have probable cause to search my vehicle while I’m parked at a post office

It might become an inconvenience if someone breaks into your car while parked at a post office and steals your gun. How do you report the theft then?

[Still Thinking]

It might become an inconvenience if someone breaks into your car while parked at a post office and steals your gun. How do you report the theft then?

Go ahead and tell the cops, probably. I'm sure they don't care about this stupid regulation.