Noticed a large dump truck driving around a construction site at the airport and the dump trailer it was carrying had a hitch almost as long as the trailer. Why is this? Maneuverability? Helps with leverage when dumping the trailer?
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The tandem(two back axes) dump truck can pull a couple kinds of trailers. I know them as “Truck and pup” and “Truck and trailer”
The Truck and Pup is what you’d consider a normal trailer with a long hitch and its own box to dump. This box is about 1/2 – 3/4 the size of the dump trucks. As /u/ginger_whiskers says, with the long hitch, it can dump both loads without unhitching. https://youtu.be/AGQl07__CtM?t=7m7s
The truck and Trailer is more interesting IMO. This is a dump truck, pulling a trailer with a set of wheels and a hitch for another full size dump box. These like of look like a mini train. The driver can back up and twist the truck, trailer and dump,trailer into a U shape and dump the main load. It’s really impressive to watch. (Halp, I can’t find a good video of this)
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