If I was stretching the frame between or after the rear axle, I would find a donor truck (junkyard) and use the frame sections from it. Dragonslayer has an ongoing post about his build that you can check out. Renegade, Haulmark and other builders want double frame rails but Showhauler and NRC can use a single by the way they manufacture the floor and wall section, which help reinforce the frame. Good luck on your project.
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