linehaul vs trunking

linehaul

noun
  • The movement of freight by any means of transport by land, air or water between distant cities, or of passengers or cargo between terminals. 

  • A designated truck route between distant cities. 

trunking

noun
  • The movement of containers or packages between a terminal and a transporter's inland facilities, or the scheduled transportation service between locations. 

  • All the electrical and communications cables bundled together and distributed through a building. 

  • A system of ducts for cables, heating or ventilation. 

  • Plastic conduit or duct used to conceal and protect electrical wiring. 

  • A two-way radio technique that uses a control channel to automatically assign frequency channels to groups of user radios. 

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