low loader vs wade

low loader

noun
  • a lowboy semi-trailer 

wade

noun
  • A ford; a place to cross a river. 

  • An act of wading. 

verb
  • To enter recklessly. 

  • to progress with difficulty 

  • to walk through (water or similar impediment); to pass through by wading 

  • to walk through water or something that impedes progress. 

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