I just got my accent gt and have noticed that when on the interstate or other higher speed roads my car will waddle back and forth. This happens not only around semi''s but going around curves in the road or when hitting 65-70 mph. I placed a bag of quikcrete in the trunk for extra weight but there wasn''t much difference. When the car is loaded with myself and 1-2 other people (about 400 lbs.) there is not much sway. I know a sway bar would only add to the problem but are there any fixes?
Sounds like a condition I call "crabbing" or walking sideways. Expect one of your struts to be completely shot, and the other side not so bad. Probably the rears.
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car waddles - 
