I would like to disagree about the strength of that rack.
The area enclosed in a red line would form a rather strong structure if it is welded.
The vertical posts go down quite a bit and get good leverage from being attached to the tubular structure.
Depending on the thickness of the material I would be willing to say that the rack could carry a 1000 pounds.
One purpose that keeps popping into my mind is storage for tarps (I’m presumably wrong …)