It's funny I had the EXACT same thing happen to me this morning. At low speeds everything felt fine. Once I got it on the highway, I felt shaking in the entire vehicle so bad that I pulled over. I checked all the tires thinking maybe I had a flat, but everything seemed fine. Checked under the car to see if something was stuck under there but I did not think to check the inside of the wheels. I hope this is my issue as well.