Shock Vibrate

Unbalanced wheels can cause long term damage?
Hey everybody, we're about to buy a car and when we took a ride on the motorway It started to vibrate after reaching 120 km / h, it seems that the wheels must be balanced … However, if the wheels had to be balanced by a long time now, this may have caused (or may cause) long-term damage to shocks or alloys or anything else?
Be carried out and cause shocks a pattern of wear on tires chopped very similar to a road of 'washboard. Bounce each corner of the car with all his weight and see if it bounces out, or if you move a couple of times before it stops. If rebound does and you see no oil leak in the strut piston is emerging from its housing but only has to balance tires
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