The gen ii (07-21) didn't have a rear locker as an option from Toyota. It had a factory installed Limited slip differential (LSD) with some electronic configurations to use it in different ways.
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The "locker" is just that, a locking differential with no slippage. Locker = full power to both wheels, LSD= will allow slippage and is often accompanied by an electronic traction control, such as Atrac (at the diff) or Trac ( at the engine).
A locker is either on or off, usually can only be driven at extremely low speeds (5-10 mph) when engaged, and it will explicitly warn you in the owners manual about turning or accelerating on pavement.
An LSD, and all of the accompanying electronics, are on by default. Like the graphic above shows, there are different combinations of electronic settings the driver can select to make it work differently, not just within the differential, but also in terms of motor output/throttling.
There are scenarios where a locker is useful. Any time one tire is coming off the ground, that will "open" the differential, allowing one tire to spin freely in the air, and the other will just sit there. A locker would effectively lock the differential to force both tires to spin at full power.
IMO, A winch or chains are for more beneficial for most situations the average hunter will find themselves in. But if you can think of scenarios you've been in where 1 wheel spins and the other does not, you might have use for one. Keep in mind, some of the electronics in the LSD also work for some of those situations.