Paul it may pay to check using a straight edge from one side of the frame across to the other to see if the frame is sagging OR is the bulkhead twisted up over. If the frame is sitting down a little i would either cut the frame and re weld onto the chassis or cut three sides of the frame box section and realign and weld the split up.
Basically what i am saying is find out first where the problem is and work from there.
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