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Doubles

Only eight states allowed a truck to tow two trailers, but lengths varied and none of the eight were contiguous. Then congress added a provision in the FAST Act that legalized tandem towing in all states, and liberalized combination length.

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Twin 33s Would Be Safer than 28s, U of Michigan Researcher Says

Double-trailer rigs with a pair of 33-foot trailers would be “inherently more stable” and therefore safer than the twin 28s now running throughout the United States, according to John Woodrooffe, director of commercial vehicle research at the University of Michigan’s Transportation Research Institute.

Wabash Shows What a 33-Foot Pup Would Look Like

Congress is supposedly inclined to approve a proposal to allow twin 33-foot doubles. If so, trailers like this would probably become common. Tom Berg has the story from last month's TMC meeting in his Trailer Talk blog.