When I was a kid, an ice cream truck was an actual vehicle. It was a trademarked white truck that had a window cut into the side, a rear door, a shelf outside a window, pictures of what you wanted. It drove around with the same trademark ice cream truck music playing. I think I bought ice cream from the truck maybe twice as a child.
It's slightly disturbing, then, to see old Dodge vans that have holes cut in the side (obviously homemade) and have a chest freezer plugged into the cigarette lighter. The windows are tinted, and "ICE CREAM" is spray painted on the side.
Every time we pass one on the road, I cringe and listen closely for an AMBER alert.