Anchored Buoyant Meshes

Hello! I have a question about creating a buoyant mesh, such as a bridge. I want the bridge to dip and wobble depending on how much mass sits on it, and where it sits on it. It’s a spline, so I would need to be able to make anchor points inheritable from another object in the world. If I’m missing something obvoius let me know! I’m a newbie when it comes to physics in UE4 haha!

Here is the spline.