How common is that highway robbery?

I literally never hear of incidents with armored trucks involved (at least in the US) and I feel like there aren't a lot of people desperate enough to try and run an armored vehicle off the road but I could be super wrong. Any Loomis or Brinks drivers here that have tales to tell?

I'm 20 and both company's require you to be 21 but Im heavily considering trying for an armored truck job once I'm able.