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2018 RAM 3500 - Bounces

have a dually that on occasion will start bouncing uncontrollably after hitting a series of bumps usually when it happens I am traveling at highway speed and practically have to stop driving to get it to quit

The shock absorbers are suppose to hold the tires to the road.

Maybe a bad set of shocks got installed at the factory.



Problematic control arm bushings are another possibility, although this seems very unlikely in a 2018. Does this effect change when the load you are hauling is greater or lesser ? When the center of mass of the load is more toward the front vs toward the back?

A 3500 dually is a beast, designed to haul or tow heavy loads. It doesn’t make a good car. I assume this is happening when you are empty. Have you complained to your dealer?