Nope that MIG weld was pointless, it was just to seal the edge of the traction bar mount.
The plan all along was to truss the rear, and at that time properly weld the tubes to the housing. I was just hoping to get in a few runs because I was sick of building, lesson learned.
I will pound out the tubes and use a new centre section housing with the old tubes and then do a proper truss and weld the tubes to the housing at that time.
If it was fully welded and I had stonger U-bolts on the opposite side it would have helped, but based on the fact that the housing cracked and broke at every plug weld I think this would have broke even if I properly welded in the tubes, and only a truss would have prevented it.
Time to improve it.