Note: I've had this bug in a long time. Idk if it has been fixed or not. But if it has, you can just reject this.
So, as you may know, securicar mission is pretty much the only well paid legal job. I've done it a lot of times, and its enjoyable. But then, I began to think in stealing one of those cars. With well timed stalks and some route memorization, I was able to track it down twice, broke in and got it to start twice. As I try to get away and prepare to for a Cop chase, every time the truck just LITERALLY vanishes completely (I think its happends when the Civs cancell the securicar?). So, without a reward, and not nearby getaway car, I just get caught. Its a nightmare to track the truck down, but why even bother to do so if you will just get to jail? I hope it gets fixed.