juggernaut vs road train

juggernaut

noun
  • A large, cumbersome truck or lorry, especially an artic. 

  • An institution that incites destructive devotion or to which people are carelessly sacrificed. 

  • A literal or metaphorical force or object regarded as unstoppable, that will crush all in its path. 

road train

noun
  • A transport concept consisting of a conventional prime mover truck pulling two or more trailers. 

How often have the words juggernaut and road train occurred in a corpus of books? (source: Google Ngram Viewer )