http://www.bigdoer.com/19601/o...arth-and-studebaker/

QUOTE: This example is rather rare version in that it has a tag (extra) axle – it such long and heavy monster, the biggest the Barth firm made at the time, that a single back axle would have been insufficient to support it all. Not many of this style were made and we looked hard. Even more interesting, the tag axle, which is non-powered and is just along for the ride, has dual tires (most tags have singles)....