5. Reliant Robin
They presented the Reliant Robin in 1973, just in time for the oil crisis, which helped the sales. With its 850cc engine producing approximately 50 HP and weight of just under 1,103 pounds, it was surprisingly agile and fuel-efficient. It had three wheels and was one unattractive little van.
However, the three-wheel configuration was tricky in tight turns. Robins was known to flip over if the driver entered the curve too fast. So, not only did it have a problematic design, but it was also dangerous to drive.