You say you jacked up the wall then re welded the sides, in my opinion I do not think the wall is the issue it is a main goose neck frame issue. I feel the frame is flexing upward and breaking away from the wall, if the wall was sagging down one would think the fiberglass siding would crack, especially when you were jacking it back into place. Just my opinion as my self I have had frame flex issues x2 but not to this extent, Good Luck
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