The H2 was supposed to be the ultimate off road machine - it was a full sized truck chassis, with auto-inflating wheels and a massive V8 and luxury interior. A "no compromises" type of vehicle, riding high on the good name the Hummer H1 had (which was a good off-roader and very rugged, it was very closely aligned to the actual military vehicle)
It was pretty big, and pretty heavy if you actually wanted to do much serious off-roading with it. It got something like 9MPG, and almost every one I saw in person ended up pimped out with 21" rims and neon lighting and crazy subwoofers blaring out.
Once again, North America finds itself addicted to trucks and SUVs, spurred on by cheap gas. What we lack is a rolling symbol of this phenomenon; the last time it happened, it was without question the Hummer H2.
jalopnik.com
The H3 was much smaller, an attempt to reel in what Hummer had become as a brand, but it was too late. It was closer in size to the older Explorers or Grand Cherokees, and even had a version with a bed like a Jeep Gladiator.