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Message:: [QUOTE="The_possum, post: 822709, member: 20785"]that would be a B-train setup, the first trailer has a 5th wheel, to eliminate having to use a convertor dolly. It saves weight, length, and adds maneuverability. A driver that has pulled B-trains for a while, can put them almost anywhere an average person can put a single 48 or 53 footer. My buddy that pulled them would regularly back them around corners, even blind side them into spots at the TS, or into warehouses or into docks to be loaded. Thats really something you can't do with a normal set of doubles, with a convertor dolly. As for the number of axles, or where they are at, it really depends on what the requirements are for weight, and laws, like you assumed. For instance, the setup my buddy ran, was a 3 axle lead, and a 3 axle pup. The lead had a 9 foot spread, with a 9 foot lift(refered to as a tri-9) The 5th wheel is mounted about 3 feet infront of the rear axle. The pup has a closed tandem at the back, with a 9 foot lift.  So looking at the whole combo from the side, it would go...steer.....drives...9'spread..9'spread..9'spread..9'spread...tandems.[/QUOTE]