beach wagon vs landau

beach wagon

noun
  • A light open wagon with two or more seats. 

landau

noun
  • A type of lightweight, four-wheeled carriage in which the front and back passenger seats face each other. 

  • A style of automobile based around the design of landau carriages. 

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