man that sucks. I may be paranoid about theft and shit, but when in college I never left my laptop at my desk in my own room I took it every single place I went let alone left in a van in Buffalo. I've had my fair share of issues there. what its gonna to take for this shit to stop, someone hiding in the van at night with a glock? jesus christ.
Basically have a driver/van guy where it's his job to watch the van. Or install hidden cameras but that's always a lot of money.