Folks, keep in mind the size of the tractor that the OP is using. The hooks are for utility, not heavy lifting because...there's only a few hundred pounds of actual lifting capacity. Movable isn't the issue and can be an advantage for this kind of application. If heavy work was involved, welded is absolutely the way to go. But for little machines like the OP and I have, it's less of a concern, as long as they clamp securely. The BXpranded folks make really good and well thought out solutions.
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The most expensive tool is the one you buy "cheaply" and often...