From https://tfltruck.com/2018/03/truck-rewind-semi-steinwinter-supercargo-20-40-concept/

The Steinwinter Supercargo 20.40 Concept was an all-new way to solve the issues that heavy, un-aerodynamic and difficult to maneuver tractor trailers suffer from. Designed by Manfred Steinwinter in 1983, the Steinwinter Supercargo 20.40 Concept debuted at the 1983 Frankfurt Motor Show. Measuring a scant 1,170 mm (about 46-inches) tall, the Steinwinter Truck Concept was lower than many sedans of the day.

This is the concept vehicle that formed the basis for the Highwayman truck in https://lemmy.world/post/1493858

Edit: I guess according to https://silodrome.com/the-highwayman-truck/ the Highwayman truck was a modified Peterbilt, but it’s hard not to see it as a design nod to this.