What kind of hummer is the one with the back like a truck like witch model?

Both the H1 and H2 Hummers had open bed options. The H1 was the big square looking thing, and the H2 looked more like a steroid-ridden Chevy Avalanche.What kind of hummer is the one with the back like a truck like witch model?Hummer h1 , h2 and h3. The first ever was the H1 which I think looks the best.