Connecticut DOT truck 3-1892, a 1999 Freightliner with a Heil body and integral auger chain. The side dump on the passenger side raises up to facilitate moving of material to the augur chain side. Equipped with an external 100 gallon calcium tank that hangs on the tailgate. Four way reversible angle plow. Truck in the backround is truck 3-1789, a 1997 Freightliner with similar specs. 3-1892 is still in front-line service, while 3-1789 had its dump body replaced and continues to serve as a spare.
The trailers everyone is talking about are called tow plows. Towed behind a conventional plow truck, hydraulic controls turn the wheels, drop the blade and activate the augur chain. These behemoths can clear two and a half lanes in one shot. That I know of Mass., Penn., Missouri, and Iowa uses these. Granted, they do a good job, but in heavy traffic areas they are not effective. A echelon of plows will do provide the same results. If you want my opinion, these tow plows are the DOT's answer to fire service quints, do more with less.
For those interested, you tube has a bunch of videos showing the tow polws in action'
Town Of Greenburgh, NY Highway Department
Truck 23
2009 Mack Granite 4x4/Henderson Munibody (Spreader and chemical applicator intergrated into dump body) and Henderson Heavy Duty Plow
City of Ottawa, Ontario runs a fleet of over 500 plows, salt trucks and sidewalk maintenance units. I believe the fleet may be close to 600 pieces. I have managed to shoot a few rigs at the various yards when we fuel up the fire rigs, but usually don't have the info on them like I would for a fire truck. Sometimes they might not have the plows attached, but I am working on getting more of them.
One of the newer Macks. I should note that most of the fleet are equipped with live bottom dump box/salt spreader. We use a lot of salt as you can guess by the pictures!