Hello,
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
Just launch the pbo already packed, spawn the vehicle tutorial. classname is "dbo_car_tutorial".
Point to it, use K for hiding animation.
Use J for translation.
You will see when using translation/hiding animations, you can see the animation working correctly for resolution LODs, but if you try to run through it, you will be blocked by geometry.
I just want to add something, if you open the model in buldozer, and go through each lod and test hide/translation animation, you see the part moving/hiding correctly.