Vibrating rear suspenion at highway speeds?
 

Im getting a fairly harsh vibration at 65+ feel it through the steering wheel. Anyone had something similiar?

Most likely the tires need balancing.

Tires out of ballance is a common cause, especially at highway speeds but just keep in mind there are literally hundreds of different things that can cause vibrations in a car. Pay attention to conditions that cause it to happen and disappear. Speed range, engine load, current gear, accel, decel, braking, road conditions, steering condition. Any moving part big or small can cause vibrations. There is no one to fix all answer