I live in Maine (grew up in Rhode Island) and somehow managed drive for 20+ years all over New England without all wheel drive, four wheel drive or an SUV.
I had a conversation with a guy who worked for the Colorado Department of Transportation.
He told me that 40% of the single car accidents during snowstorms were SUVs, even though they were only about 10% of the registered vehicles.
Liz Neblett, a spokeswoman for the federal National Highway Traffic Safety Administration, says an S.U.V.'s longer stopping distance is a matter of simple physics. ''Bigger vehicles are harder to stop, particularly in the winter,'' she said. ''If you hit ice and put your foot on the brake, four-wheel drive isn't going to help you -- you're going to skid for a long time.''
Saying you need an SUV for snow is, 99% of the time, baloney. If you happen to live at the end of dirt road they don't plow, then sure. But if live within 3 miles of a stoplight, chances are you don't need it.
Now, I am not saying all SUVs are bad. People that use them for what they were built for (towing & offroad) are fine. Ditto for Trucks and vans.
I own a Jeep Wrangler and probably get around 15mpg. On the other hand, I only drive it about 6000 miles/year. And I do go offroad with it. But most of the time, to do longer drives or anytime I need to move the family (wife, baby, dog) we take our Passat Wagon.
My issue with H2 or H3 is that they are not great offroad (pretty much any Jeep or Land Rover will kick their butt), the don't handle well in snow, or at high speed.
So, as the original question, why a hummer? I have no idea. Its like Windows, it works, but why would you want to do that to yourself?