Probably technique. I am short, about 5'7" and could get my R100RS (heavy bitch she was, lovely though) and R80RT on the CS easy. BUT I did it by pulling it a few inches further forward than I wanted it actually parked, then pushed the stand down with the foot, and rolled it BACK whilst pulling up on the handle all whilst pushing down with the foot. It'll pop right on that way. Don't try to lift it straight up onto the centre stand.
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