I have an 07 Wrangler (approx 10K miles) and have experienced this twice before though less severe. Last night in a left hand bending freeway on ramp, I hit a bump/pothole, going approx 50 MPH and the jeep began to vibrate/shake violently. I had to slow down to almost a stop before the vibration passed and I was able to proceed. In the vibration, the jeep was shaking so severe, it was even difficult to steer it off the road. Very scary! Anyone experienced this? Any suggestions?