I know about that videos but, will be better if Epic add this to the Learn resources or to a “Official” documentation.
Anyway, i going to see the stream of today, after the stream i will tell you if the tank have something type of simulation in the treads with physics & wheels in the treads (Basic) or is a simple treads animated material without physics. (If in a stream you can’t make a complete vehicle (code) then put this as sample)
*Because in the screen the tank don’t have wheels in the treads…
This need a working/complete vehicles, check the Unity 5 airplane example, check the code, about that i say.