I don't see how a truck can be autonomous at this point in time at least. Or delivering stuff from point A -> B can work. But, imo that's only part of what a truck is used for... the solutions a truck provide often involve getting into tough situations that require some planning and coordination...
Tesla doesn’t support it that it’s true. But there is a third party app called Sentry Pro that sends you notifications. I have been using it for a couple of months now and it works very nicely for me.
Yes, Sentry Pro is quite useful when parked at relative quiet places, where people are normally not going to be around your car. Having it on at a mall parking will probably give you notification fatigue...