Moving the axles back and then adding onto the rear is the best. Any joint you have before the axles is a place to crack and break. The back is just along for the ride and is not subject to torque twisting. It does need to be welded and plated by a competent welder. If you go to a truck shop that installs bodies they do it all the time. One of the best place to get frame rails is where they scrap school busses.
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