I reckon I know this bit.
Was there with bro in his then new Td5. I has diff locks front and rear, but no CDL(non internals)
Struggled a little on the climb up a rock step, locked rear, no go, locked front too .. and all that happened was that either front axle or rear axle would spin up independently of each other .. so no upward travels.
Unlocked the front again, and a bit more juice, and then the traction control kicked in. 
So we worked out first hand, how twin locked D2 with no CDL wasn't the good idea that the previous owner that fitted them thought they'd be. 
I have the GPS log of the drive too, but I was having trouble with that version of Ozi, that shut itself down randomly .. and of course shut itself down at this point 
 
The other one I remember, and looking back at the GPS log, was Amblers lane, near the camp site there, cross the creek. Another rock step where the lockers didn't really help.
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