Transfer Dump Truck

A transfer dump (colloquially referred to as a "Slam-Bang!" because of the noise made when transferring) is a standard dump truck which pulls a separate trailer which can also be loaded with aggregate (gravel, sand, asphalt, klinker, snow, wood chips, triple mix, etc.)

The second aggregate container, (B box) on the trailer which is powered by either an electric, pneumatic motor or hydraulic line from a PTO (power take off) mounted on the transmission of the tractor, rides on small wheels and rolls on rails off of the trailer frame and into the empty main dump (A) box. The key advantage of this configuration is to maximize payload capacity without sacrificing the maneuverability of the short and nimble standard dump truck. Transfer dumps are typically seen in the western United States because of the peculiar weight restrictions on western highways.

Another configuration seen is called a Triple Transfer Train, which consists of a B and C box. These beasts are common on Nevada and Utah Highways but not in California. Depending on the axle arrangement, a Triple Transfer can haul up to 129,000 with a special permit in certain US states. The Triple Transfer usually costs a contactor about $105 an hour while a A/B config usually runs about $85 per hour (2007 stats).
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Here are some points to consider before renting a dump truck.
Which Dump Truck Do I Need?

One of the first things to consider is fuel efficiency and load capacity; however, a decision should not be solely based on those factors as the engine, chassis, transmission and other essential specifications must be carefully considered as well.
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How A Transfer Dump Truck Works