I have a trailer that needs a new A frame, it's made of 50 x 50 x 2mm tube. A repair has been attempted in the past by welding up the cracks and welding 50 x 2mm angle iron to the outside and bottom faces(I haven't removed yet as I'm pretty sure the A frame will fall apart).

I've cut the tray out. ATM I'm guessing it failed across the top of the tube first. The front of the trailer has been welded to the tube on all four sides, I assume it was made like that as you cant get to the ones in the picture without taking the tray out. I recall this being a bad idea. So with the replacement, weld all the way around or just the sides?

Thanks
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