I remember Jeremy Clarkson rolling over in the Reliant Robin. But they have exaggerated about the Robin's tendency to rollover, that red one used in the test had some weight added at its right side to make it roll more easily. By the other side, a reverse-trike like the Morgan is way harder to have stability issues...
Did Hammond nearly roll his Morgan? I remember the comparo but haven't watched it lately, as I recall the Morgan, while minimalist and a bit of punishing ride in certain respects, was pretty stable.
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