Physics kinetic mode make objects disappear

I try to follow simple tutorial on how to make user controlled vehicle but i’m very unsuccessful. In physics mode if you apply kinetic mode for objects they disappear when being simulated. Why is this happening?
As well if someone could help me find out why my vehicle doesn’t move i would be very thankful cuz now i am completely frustrated.
Blender: Dropbox - File Deleted - Simplify your life
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