That depends on wheel hardness and strength. The only thing that can happen if you powerslide is your wheels can wear away in one spot making part of the wheel flat. If this happens, you wheels are ruined. Other than that powersliding cant really damage the rest of your skateboard.
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No, it will not damage your trucks. The only thing it will do is it might give your wheels flat spots. Even though it's never happened to me, I know several people that got them by doing powerslides.