At first I thought this was just for a hitch ball. And my thinking was that my bucket is too high for my little trailer. I need receivers on bottom. I've C-clamped a receiver to bucket and it worked pretty good.
Then I realized what you were doing. Versatile attachment for all kinds of things. Hooks, guards, handrails?, tool caddies,... I do think this is probably the best idea to come along in some time. I'd vote for it. It's up there with the ammo box tool box.