Get away from that dealer and call Kia, that dealer is flat out trying to steal from you. If you have a suspension problem the factory warranty Wil cover it. Take it for a guy that is the quality control to keep people and warranty companies from shady techs and dealers. Kia factory warranties are very forgiving, if you find a honest dealer they will take care of you. Your cupping however is probably from towing, those little suvs don't like any squat, they do beat up tires if they squat. Just rotate them more frequently, however I bet your bushings are fine. And bushings are not and never will be, "a wear item" that is ludicrous, everything could be considered a wear item, the hood latch won't last forever. Whoever told you they are a wear item is anther hustler.