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I have a 2016 f250. It has only 70,000 miles and it literally feels like a fast dribbling ball when you hit bumps. Tired are new and balanced,shocks are brand new. It does it in the front as well as the rear. Going 60mph it almost develops a uncontrollable shaking. Add a fifthwheel and its even worse. Any ideas? Who elses f250 sits dead flat with no rake?
Have you checked the driveshaft u-joints? If they're no longer moving freely it will give off that wobbly wiggle feeling from inside. Especially if the driveshaft angle changes due to bumps.