Trees responding to wind (without Unity terrain or wind zones)

what is the best way of having wind (or wind like effect) in the scene without using the Unity terrain system. The reason is that I want to be able to release the game on mobile where terrain is not supported.

So basically I have a tree model game object and terrain object generated in 3DS Max.

a simple random bending behaviour would do (with the root being fixed).

any ideas about this?

Simple 3 joint setup?
Then you can bend it either via keyframes, or via code.
If you do it via code, you can define a global “wind zone” that acts in a certain vector and make all the trees behave similarly even if they’re random rotated etc…