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STAA doubles or double pups are a Long Combination Vehicle that make up less than 3% of the freight trailer fleet in the US. Each trailer is 28.5 feet long and 8.5 feet wide. The doubles are connected via a dolly. This long combination vehicle is the only combination of trailers allowed nationwide in America. The axle weight allowed is 20,000 lbs per single axle.
References
STAA doubles Wikipedia(Text) CC BY-SA