It's a brick that carries cargo!
Other vehicles: https://www.artstation.com/artwork/ZrAKR https://www.artstation.com/artwork/3N8vD https://www.artstation.com/artwork/WWWN2 https://www.artstation.com/artwork/BmaGrr https://www.artstation.com/artwork/Vd89gX https://www.artstation.com/artwork/XBqxDY
