Trucks mostly use locker differentials. GM had a fetish for them on trucks because clutch type diffs tend to make towing a little strange if there is any small variation in rear tire size from side to side. Also with unloaded beds, the trucks tend to push like a cheap lawn tractor on wet grass on slippery surfaces.
Lockers are harsh heck when they engage. Slip a tire on wet pavement and you’ll get a BANG from the rear as it engages. An open diff will just spin. GM has adopted an even worse diff on trucks called a rev-loc which prevents the locker from engaging above about 25 mph.
Lockers are not used much in drag cars, they usually lock the axles together with “spools”. Spools are not acceptable for street use!
The best differential is the gear type or Torsen or Tru-Trac. The torque is vectored to the wheel that can accept the greatest amount of traction. No bang, no trailer drift, no push. They won’t work for rock crawlers because if one tire is off the ground completely, they spin like an open diff. Hence the need for an air-locker.