Right I see, yes I was confused why you posted it here, seemed like you were asking for a Skateboard asset in SketchUp.
I would just learn to rig in Unity, on the list of all the things you have to do in order to make it work, it’s one of the most simple.
All of the Skateboard models on Turboquid and 3D warehouse are game ready, they just require rigging + collision meshes. You can bypass Blender if it’s proving hard and go straight to the game engine but you will need SketchUp Pro.
MS Physics wont help with this as nothing from the plugin can be exported to Unity.