Tractors tend to have erm Lastschaltgetriebe dunno the English term. Transmissions that can shift under load, without dropping torque. With regards to what I said what's important is whether they have a fluid coupling as that's where torque losses and heat generation occur, and they generally don't, they have dual clutches instead. You also see continuously variable transmissions, as well as plain old manual ones if you simply don't need fancy.

Computer-automated clutches, sure, but that makes them computer-actuated manuals, not automatic as in something that can select gears in a purely mechanical fashion.

Coming back to Unimogs: Also, in principle tractor transmissions. Number of clutches can get involved because power takeoff points. From a driver's experience they either shift completely automatically, or you select gears but the computer does the clutching, or, and this is something you don't really see in tractors, you can also operate the clutch manually because it's very useful in certain offroad situations. Mechanically, though, as said, they're manual transmissions, hydraulically actuated, controlled by computer.