Trabant is a series of small cars produced from 1957 to 1991 by former East German car manufacturer VEB Sachsenring Automobilwerke Zwickau. In total, four different models were made, the Trabant 500, Trabant 600, Trabant 601, and the Trabant 1.1. The first Trabant model, the Trabant 500, was a modern car when it was introduced in 1957.
Aging Wheels' videos about his trabant, while not documentaries, show a lot about the car.
You beat me to it. Here's a link to his most recent video. https://youtu.be/K_qyA7QuOLg