2012 Griffin King of the Hammers race. This rock racing event attracts thousands of people for a week's worth of off-road goodness. It also bring out a huge variety of off-road vehicles to both race and spectate. While actually not the only Kei truck at the event, this little Mitsubishi Minicab stuck out in a crowd of enormous 4x4s. Since it was located where it was on a sandy hill, I'm assuming it's a 4WD model; even on its tiny highway tires it made there. I'll see if I can snag some more photos of the small trucks at this year's King of the Hammers.
You can see all kinds of photos from the event on Warn Industries' Facebook page.