It's currently not possible to animate geometries inside a vehicle right now.
Translation and hide animations doesn't do anything on all geometries of the vehicle. But all resolution LODs working.
I will add source and pbo packed inside steps to reproduce so you can easily test it.
This is a video, so you can understrand easily : https://gyazo.com/afc2fba1de6a4fad0e615407e68193f1