With all this talk of devices to stop the cab doors being opened it got me thinking. Is it just not a lot easier for a would be thief just to force open one of the flimsy plastic windows in the hab area? I tend to think if they want in they will get in. Preventing it being driven away seems a lot more important then if they mange that a well hidden tracker is next on the list.
Depends on the thief, the circumstances, and what they are trying to steal. It may be easier if they don't mind climbing in and out of windows on an unattended van, although it's even easier to manipulate the door locks and won't attract so much attention unless there is an alarm, as entering via a cab door looks less suspicious than clambering in a window.
But entering through the cab doors appears to be the method of choice for the thieves that like to enter vans whilst the occupants are asleep, to steal handbags, wallets and other valuables. Quick and silent (alarm not withstanding).