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Yeah, weld a threaded tab under the hoop to inside. Or drill into hoop, then weld threaded sleeves In. If they have a flange, easier to weld.
The strongest you can be is to weld something on. . Don't let poor planning get in the way of well built. Is it painted already. The problem with rivnuts or tapping they are all sort of in one line, a triangle or square mounting system is better once that weight starts bouncing around..