2002 Ford Focus steering problems

Dt: the consumer stated while driving at 35 MPH the vehicle began to vibrate. The steering wheel was hard to turn and the consumer lost control of the vehicle. The vehicle fish tailed across the road and struck a mail box. At some point during the skid or impact with the mail box, both rear wheels dislodged from the vehicle. Additionally, the bolts holding the rear seat dismembered and the rear seat was ejected from the vehicle. One of the vehicle occupants died as a result of the accident and another was injured.

Problem I'm still having and was reported to dealership is car pulls to left, ( not corrected) back end of car or tires bounce on road and especially when hitting a bump, cannot stay on road in slush or snow, back end is all over road, ( nothing done) tires are completely groved in many spots on the tires, caused by rear end bouncing on road, firestone won't replace they say it is focas's rear end and it wears out the tires, dealer or ford won't do anything about rear end or tires, car vibrates badly, rear doors…