Ripdavey the overall length laws were crazy. They did weird things like make a unit that transformed from a set of twins to a truck and full trailer to traverse the northwest part of PA where I-90 crosses because OH and NY allowed twins but PA didn't. There were tractors with concave rear panels to nestle the trailer as close as possible. Old trailers angled front corners so trailer wouldn't hit Tractor when it turned . Sleeper boxes above the driver seat . It was all to conform with overall length laws. Nowadays as long as the trailer is under 53' were good, stretch em out!
Consolidated Freightways had a couple of unusual operations to get doubles across Pennsylvania. On the short section of I90 between Ohio and New York, CF had one or more tractors with large concrete blocks where the fifth wheel would normally be. These were stationed at the Ohio or New York line and when a doubles unit needed to cross PA, the road unit would be broken down with the dolly still under the kite. The original tractor would continue across PA with the lead trailer and the special tractor with the concrete block would pull the kite with the dolly still underneath effectively making it a full trailer. The concrete block of course was to add weight to the tractor to make this operation safe.
Then, going across PA on I80, CF had special tractors which allowed the lead trailer to slide ahead on the tractor frame effectively making that combination a straight job so to speak, pulling a full trailer (kite plus dolly) behind. CF was innovative to say the least.
https://www.hemmings.com/blog/article/keystone-squeeze-play/