I’m not as old as you, but I remember window trays at Dog n Suds (and our local, the Mug-n-Bun) in the 90s. They did actually clip on the window, and if you had your window fully open they had you roll it up an inch or two so it could attach. I assume that wasn’t new technology at the time. They didn’t look quite like this, though; they were cantilevered on rubber pads so that the top of the tray lined up with the top of the window. By then they had moved away from glass serving dishes to Styrofoam with lids, so it wasn’t really a problem to get things into the car, height-wise.
I mean, this is almost certainly a staged display for a car show, but I’m just verifying that these trays (well, ones kind of like these) do exist and were (are?) used.
I’m not as old as you, but I remember window trays at Dog n Suds (and our local, the Mug-n-Bun) in the 90s. They did actually clip on the window, and if you had your window fully open they had you roll it up an inch or two so it could attach. I assume that wasn’t new technology at the time. They didn’t look quite like this, though; they were cantilevered on rubber pads so that the top of the tray lined up with the top of the window. By then they had moved away from glass serving dishes to Styrofoam with lids, so it wasn’t really a problem to get things into the car, height-wise.
I mean, this is almost certainly a staged display for a car show, but I’m just verifying that these trays (well, ones kind of like these) do exist and were (are?) used.