Minecraft wiki entry for Vehicle, associated text:  CustomDisplayTile: Optional. 1 or 0 (true/false) - whether to display the custom tile in this minecart.
 DisplayOffset: Optional. The offset of the block displayed in the Minecart in pixels. Positive values move the block upwards, while negative values move it downwards. A value of 16 moves the block up by exactly one multiple of its height.
 DisplayState: Optional. The custom block in the minecart.
 Name: The resource location of the custom block.
 Properties: Optional. The block states of the custom block.
 Name: The block state name and it's value.