Found some info on the CA DMV site. If I read this correctly the length for doubles is 75'. Length Of Vehicle/Loads—Combination Vehicles In a combination of vehicles, auxiliary parts or equipment which do not provide space for carrying a load or are not used to support or carry the vehicle may exceed the single vehicle length limit, but the combination may not exceed the length limit for combinations. An articulated bus or trolley coach cannot exceed a length of 60 feet. A semitrailer being towed by a motor truck or truck tractor may exceed 40 feet when certain conditions are met. (VC §35400b[4]) A combination of a truck tractor and a trailer coupled together shall not exceed a total length of 65 feet except as provided in VC §§35401 and 35401.5. A combination of vehicles consisting of a truck tractor, a semitrailer, and a trailer cannot be longer than 75 feet, providing the length of either trailer does not exceed 28 feet 6 inches. If posted, cities and counties may prohibit a combination of vehicles in excess of 60 feet in length on highways they control. Other exceptions can be found in VC §35401.5. Extension devices are allowed with restrictions. See VC §35402. The load length on any vehicle or combination of vehicles may not be more than 75 feet long measured from the front of vehicle or load to the back of vehicle or load.
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