I think that’s as close as I’ve seen, though “Grossmobile” doesn’t ring a bell, and “The Thing” was bigger and enclosed (I think)
I’m basing this on some pretty old memories, of a show that didn’t last very long. The actors seem the right age in this one, and the setting is right on the money, as the timing. I feel like it was late 70’s to early 80’s and this is right there.
I’m probably gonna have to say this is the one, barring anything better popping up.
That’s some pretty damn good sleuthing on your part! I spent the batter part of three hours chasing this one and finally posted here.
Nice work!