Anyone see the news about the 1938 Packard at a concours show, winning the 'Best of Show' award, then rolling backward into a lagoon because the idiot owner forgot to set the parking brake? Likely, he parked it on the grass and thought, wrongly, "It won't roll."
It's interesting to note, that every photo shows a particular brand of car under transport, that the transporting truck does or just about matches the brand of cars on the truck.
That's the way it used to be if the Manufacturer of the cars also made Medium of Heavy Duty Trucks. I noticed a change around the mid 70's a few years after Chrysler stopped making them.