Japan takes its subcultures very seriously and while many of them, like rockabilly, goth and lolita, have some sort of equivalent in the U.S., Dekotora (the lavish decoration of a semi) doesn't. You can find out more about this culture and see some amazing pictures of these blinged out trucks over on Flavorwire.
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I loved the 5th one - it looked like an out of order rainbow. I'm amazed that drivers can see out of the windscreens and I'd hate to run into one on the road. Not only do they look intimidating, the sun/headlights bouncing off them would blind you.
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