rear tire on 1990 Mercedes-Benz 300CE

i wonder why my rear tire keep wearing off in one side &so fast?

Asked by for the 1990 Mercedes-Benz 300CE
Have a 4 wheel alignment done at a reputable tire shop. Tire wear can be read like a book. wear on one edge, wear on both other edges, center thread or cupping of the thread each have an explanation. Too much camber, something bent or "toe set" causes wear.
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your girl is to big