forklift vs side-loader

forklift

noun
  • A small industrial vehicle with a power-operated fork-like pronged platform that can be raised and lowered for insertion under a load, often on pallets, to be lifted and moved. 

verb
  • To move or stack with, or as if with, such a vehicle. 

side-loader

noun
  • A forklift truck which has its forks mounted on one side. 

How often have the words forklift and side-loader occurred in a corpus of books? (source: Google Ngram Viewer )