Lots are automatic, but some are still manual.
https://www.roadtrains.com.au/tech-tips/how-to-drive-an-18-speed-roadranger/
i said it merely because i thought it prolly takes a real driver not to smoke a clutch getting that train moving
and it must be a hell of a clutch, or are they some kind of hydraulic clutch?
My 21 year old son and s a trucker. He has a brand new tractor. Manual.