1st incident-driving on the highway the truck started violently shaking after hitting a small rise going over an overpass. extremely blessed that i was in an express lane (tolled) and no one was around me. 16ft trailer was hooked up and it took every bit of strength i had to keep the truck in the 2 lanes and not the wall. thankful no other vehicles were around me. 2nd incident- again driving on the highway the next day; a very small bump in the road caused the violent shaking. i was not towing, but i did have vehicles around me this time that thankfully were paying attention as i was in and out of the fast and middle lane. the experience is indescribable and frightening.
While parking, foot on brake, engine increased rpm to very high level. 2019 truck with 41 miles, vehicle was stationary.