More info from that site:
Keeping You Safe
Welcome to SaferCar.gov, where you can identify and report problems you might be having with your vehicle, tires, equipment or car seats. If you think you have a problem, we want you to tell us about it. We are the Office of Defects Investigation, or ODI. We are a part of the U.S. DOT's National Highway Traffic Safety Administration, the nation's only agency authorized to conduct defect investigations and administer safety recalls on everything from vehicles and equipment to tires and child safety seats. Our engineers and investigators look into problems you report to help ensure you and others stay safe on our nation's roads and highways.
Why your complaint is importantYour complaint information will be entered into NHTSA-ODI's vehicle owner's complaint database and used with other complaints to determine if a safety-related defect trend exists.
If a safety-related defect exists in a motor vehicle or item of motor vehicle equipment, the manufacturer must provide a remedy at no cost to the owner. Your complaint is the first step in the process.
We do not have to receive a specific number of complaints before we look into a problem. We gather all available information on a problem. Your complaint is important to us.
Seems like if all you filed about the vibration it would help.
https://www-odi.nhtsa.dot.gov/ivoq/