the 5th wheel on the kw is just like the one that comes on 8258 and doesn't latch on to the trailers kingpin just pretty much for looks and i like your 5th wheel better
I built this moc also for my 8258 but realized i needed a better truck for it so i built Jurgen Krooshoop's basic Kenworth w900 the only thing left now is to adapt the 5th wheel