Justin, I run air lockers in my 80 series cruiser. I have found that in the sand I tend to flick them on then off all the time (the bonus of air lockers). If I am bogging down and going to dig in I turn them off to save burying all 4 wheels in, but if I'm just running in soft stuff and I have the momentum I leave the rear in to help push me along.
If you are asking to find out what type of locker to buy, then the answer is, there is only one, the ARB Air Locker, (no affiliation). Just look around to those that know and go along to some of the meets at Landcruiser Mountain Park and ask around.
I don't know anyone who goes off roading and needs lockers that hasn't either got air lockers to start with or have ripped out the others and then put air lockers in. The other bonus is that you get an air compressor for pumping up your tyres when you've finished on the beech.
HTH
Corry