zip ties
Mine have lasted a few thousand miles and no breaks.
One thing I did was to make the gap over the coroplast a bit wider than through the rims, so the tie wouldn't bend sharply on the rim, and maybe that helped. For example the gap on the rims is about 1 inch, and I made the gap on the coroplast 2", though probably 1.5" would be wide enough and use less length of the ties, making them easier to put on.
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