Tl* the contact owns a 2014 chevrolet g1500 3lt express rv. the contact stated that the vehicle was driving rough upon going over a bump in the road or unleveled land. the vehicle was shuttering and the suspension was unstable intermittently. the vehicle was taken to more than one authorized dealer several times, who was not able to replicate the failure. the manufacturer was notified of the failure. the approximate failure mileage was 350.