It's certainly been worrying, that's for sure. The expensive pole lives inside at night, but it would be the irritation of replacing everyday stuff that would annoy me. As far as I know the passenger opened the back door and had a good look inside. If not the theft or potential for theft, then it's the sheer bad manners of it that got me. Initially.
The upside, apart from the other customers alerting me, is that it's spurred me in to getting the adaptations made to my van that I've thought about before.
No-one followed me home, I'm sure of that, and my parking arrangement makes it incredibly difficult to get in at the side or back doors - unless you are actually 2D or a ghost. And then the cctv would catch them. But still....
I won't be letting this lie either.