my trailers use 10 inch rims and tyres from the old mini car ,145/10 rated at max 315kgs /694 ibs,each,its the old mini size tyres you need as they went on to 12 inch in the late 1980s along with the metro,try a scrap yard or some one that breaks old minis , i got a couple last year that had been spare wheels and had never been used .
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