The Dekotora tradition started in 1975 when the first of a series of 10 movies called Truck guys was released. The movie featured a protagonist costumed trucker who drove his insanely decorated truck all over Japan. The movie was a big hit with both old and young, and caused a wave of Dekotora popularity to sweep the country. While Dekotoras were present throughout the 1970s, before the movie they were restricted to the north-eastern fishing transport trucks.
sumber :http://www.amusingplanet.com/2010/11/dekotora-ridiculously-decorated-trucks.html