You're right kwilford, I think it is Opel OEM. The trailer belongs to a friend of mine, and I'll double check the make. However hardly above 4,5".
It's hard to find these were everything is as delivered from factory. Here in northern Europe most of the Rallyes was "destroyed" in rallies, as they were very competitive at that time. However this one had the original paint and 100% of all mechanical stuff intact.
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