They are also good in areas where it snows almost daily. Like the areas that get lake effect snow. I have photos of one on my website. We all know how each time you plow you lose parking spaces. A blower eliminates this problem. It is usually cheaper than a loader, and can shoot the snow far from the edge of the parking area or driveway.
The one in Northern with the 24 HP Kohler engine does't seem like it would have enough power to blow very deep snow with a 7' cut. I have a 20 HP diesel in my JD and a 4' two stage blower and I can make it pull down in deep snow if I go to fast. This is why I said that a plow is faster, but as you said Chuck, it will get the snow out of there and you could also load a truck with it if you had to.
It would be a great set up since the Northern blower will fit on your regular snow plow mounts on the truck and I would think other mfgs are the same. Fast change over is nice when you are in a hurry to eat snow.
There was a company called Pack Systems that was making truck mount blowers but their web site is not running anymore. Their blower was like the one at Northern Tools, but they did tell me they are working on a hydrolic blower that had the motor in the back of the truck. This way the front end would only have to deal with the blower weight only, and the motor in back could be much bigger than the mid 20hp engines mounted in front.
The picture I posted above.... that truck has a bed mounted 327 Chevy V8. The blower is old, and it has stenciled on the side SNO - BLO. I have no idea who makes it. My brother is going to see the guy tomorrow, I will ask him to find out who makes the blower. He will be sledding in the Tug Hill/Booneville NY area for the next week in case any of you sled there too.
We built ours using a 7' 2 auger blower which was designed to go on the back of a farm tractor.
We fabricated it to fit on a truck, mounted a hydrualic motor on it and a Chevrolet 350 engine in back to drive a hydraulic pump. Engine makes 285hp - hydraulic power loss = about 200hp at the blower fan.
It still bogs down when hogging out windrowed snow, but it probably works better than the 24hp one in the Northern catalog.