The Hummer H3 is a sport utility vehicle/off-road vehicle from Hummer that was produced from 2005 to 2010 by GM, not AM General like the earlier H1 and H2. It was introduced for the 2006 model year, based on a modified GMT355 that underpinned the Chevrolet Colorado/GMC Canyon compact pickup trucks that were also built at GM's Shreveport Operations in Shreveport, Louisiana and the Port Elizabeth plant in South Africa. The H3 was the smallest Hummer model. It was available either as a traditional midsize SUV or as a midsize pickup known as the H3T. The H3 and the Colorado/Canyon are very different. GM claims they share only 10% of their components, with the chassis modified and reinforced for heavy off-road duties.