The broken driver side bracket in the third picture clearly shows how the assembly bolts to the Vue's frame, three bolts on each side, ABOVE the square tube cross piece that carries the Attachment Tabs. BUT there is nothing BELOW the square cross tube. Every Start, Stop, and Jiggle caused a twisting tendency in that cross piece. And nothing below the tube to counter that torque. Broke where I thought it could, from looking at the parts drawing and picture 11-B in
BX3317 Instructions, before Avan posted the pictres.
The steel "crystallized" from repeated stressing, and failed like it was cut with a saw. I saw that on a boat trailer coupler. Came off like it'd been cut with a band saw.
Avan, THANKS for posting the situation and the details. It'll help us all to be more vigilant.