How do you know? Have you actually asked them? Serious question, because you are right, I never have asked. If the company and my union have negotiated for more money that incorporates an amount of per diem to include a van tip, then there is no excuse. I just don't think that is the case, but I would love to know. And yes I have worked as a waiter in college, however I recieved less that minimum wage on the expectation of tips. As far as I know, van drivers are paid appropriately for driving the vehicle and receive a tip for handling my bag, which I do tip for.