As my setup in that link mentions there may be other settings that you may need as well. 
For the vehicle not breaking through on the first impact, I cover this in another post I made here: [TUTORIALS] Photons Be Free: Mini-tutorials and other curiosities - Community & Industry Discussion - Epic Developer Community Forums
You will need to set the Custom Impact Resistance to a low value. This will only work with 4.8 and later though since it’s been bugged up to this point.
Once 4.8 releases you will be able to use that setting all you want. We do have the preview releases starting very soon, but I absolutely DO NOT recommend using this for your development project. There are always known issues with preview releases as it’s being actively developed which can cause things to break week to week as we do the preview builds. If you need to test a setting it would be a good way to check and see how it works though.
Feel free to ask any destructibles questions. This is an area of the engine I work with often and if something is bugged I would likely know.