MineCraft CAR?! All in Vanilla with NOTHING External!
COMMAND:
/summon MinecartRideable ~ ~2 ~-1 {Riding:{id:MinecartRideable,Riding:{id:MinecartRideable,Riding:{id:MinecartRideable,Riding:{id:MinecartRideable,Riding:{id:MinecartRideable,Riding:{id:MinecartRideable}}}}}}}
Must be typed and/or copy-pasted EXACTLY as shown.