Amer-team
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I did something similar but used bolted D-rings to catch into the supports underneath. For the center supports that are boxed in, I made tapered square washers so the nuts would seat flat. For the open channel supports, I bolted in an angle iron to stiffen the support. Ran an FEA at work that showed the open channel needed stiffening. The holes are for wrench access.
I use these for chaining logs down, so wanted something stout.
Thank you for the pictures. That is almost exactly what I had done, except we welded them in. and I added one in the center front to use as a pull point.