I have used my mh to drive to concerts our band was playing at. Sometimes we brought along some roadies, who would partake in a few cocktails on the way there. As long as the driver, {me} were not partaking in the festivities, I don't see why there should be a problem. We made sure the curtains stayed closed so nothing was visible from the outside. They sat at the table, and played cards on the way there. Im sure most would say no drinking allowed, but I don't see the problem as long as it is not interfering with the driver. I don't see the difference what the passenger is doing, as long as the driver is being responsible.