Dude that sucks. The local news showed folks prowling the garage at DIA. Not enough security and when one does come rolling by the look out sees them coming and it’s easy to hide. They can work without interruption most of the time.
I’d suggest getting some stuff from
www.JimmiJammer.com. They make a jam plate to prevent somebody from prying up below the door handle to access the lock rod as using a hose clamp around the plastic mount for the lock cylinder to strengthen it. The jam plate goes over the lock and clamp to prevent it from being punched in.
A thief might screw up the door trying to get in but when they are slowed down by it they will move on to the next one hopefully. Part number 031502 for a gmt800 truck.