Steering Wheel Vibrate problems of the 2008 Jeep Patriot

Severe steering wheel vibration at elevated speed. Front ball joints shot and cannot be serviced due to design. Replaced front left and front right lower control arms, plus 2 tires with only 11k miles. Problem appears to be sudden/rapid deterioration and catastrophic failure since all 4 tires were replaced at 50k miles with zero evidence of abnormal wear and no steering issues. Vehicle has not been wrecked or driven off-road. Numerous Jeep forums and blogs with complaints about the 2008 Jeep Patriot front suspension. Local Jeep dealer service manager claimed never seen this issue before or replaced any lower control arms on this year, make and model. Had work done at independent garage since dealer service manager was apparently not telling the truth or withholding facts.