Could you not use the American mule tires? They are 7.50 X 10. A bit smaller, but they are available new.
I did a mockup restoration of a 6 pounder a decade back. I ended up welding a set of 6 pounder rims into Iltis 16" rims and installation 7X16 non directionals on it. They are a bit big, but again, fresh and safe for city towing.
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