I thought it wouldn't happen to me. I was travelling down with my 17 year old daughter in my 7 1/2 ton lorry when we stopped at the services just north of tarragona (which I since found out is notorious for this). We made sure nothing was in view I. The cab and I pulled up between two other lorries right in front of the fuel pumps. The drivers side window was smashed and the thief crawled through all the broken glass to get my daughters ballet shoes, her uni cards and her iPhone charger. She (as we later found out ) missed my £600 sat nav, the iPhone itself, and numerous other stuff of value.
The police were very helpful. The service station was NOT. Their cameras don't work???
The lorry driver who was in his cab beside my lorry saw the girl aged about 8 or 9  get out of the passenger door right in front of him, but couldn't describe her ?? 
We got everything back in the end, except the ballet shoes, but the inconvenience was unbelievable. Try following a police car through the back streets of tarragona in a massive lorry.
Take care, I always will........now

By the way, the shoes worth maybe a couple of quid cost me 268€ for a new side window.