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joe dog. Device with a dead axle that converts a single-axle tractor to a tandem-axle tractor. It hooks over the tractor's fifth wheel, replacing it with another for the semi to be hooked onto. This is a specialized term exclusive to the drayage industry. The origins are unclear. It may be that this dog is a considered a kind of latch. Or it maybe that the joe dog acts as a kind of leash in pulling the second trailer behind.
Elusive as the origins are, it seems likely that the use of joe dogs led to double-bottoms or tandem trailers being referred to as “a set of pups.”
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1. Industry Terms. 2002. Markel Professional Transport Training. Accessed May 2 2003 from http:// www. markeltraining.ca/ industry-i-q.html .
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| About the illustrations: Figure 1 shows a classic single axle joe dog. Figure 2 shows how the joe dog (in this case, one with two axles) is employed. Illustrations by the author. | Last updated: July 28, 2009 | ||||||||||||
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