Those roller coaster roads are bad on cars, but try driving on one in an articulating vehicle like my F250 truck hauling an RV trailer. They can get into an asynchronous cycle that is outright funny if it weren't so dangerous.
I believe the worse was when I was driving on I-40 through Oklahoma City a few years ago. I hit a particularly bad stretch of uneven concrete slabs while hauling a 27-foot RV trailer, and the combination of truck-and-trailer was bucking so badly I literally was banging my head on the roof of the truck. Coffee everywhere. Noise and motion coming from myriad flying objects in the cabin. I would have lost control if I wasn't being held down by seatbelts.
Crazy.
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