Pete 388 frame

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Hey guys I’m looking at a 09 388 double frame flat bed It had a front end crash that was fixed but owner said frame is good. Under cab the inner and outer top and bottom flanges don’t line up. They r stepped in and out different on each side. They don’t line up like the rest of frame is this normal from factory. Or r rails out of wack. I own Mack’s and kw. There inner and outer frames rails all match front to rear. Ty.