My 105 series had ARB airlockers in the front and rear. Bloody fantastic things, and I would put them in my 100 series if I could justify the money. I didn't use them often, but when I did they got me out of the sh*t and saved me a long walk home. In the three winters I owned it we were doing quite a lot of new planting in the high country, so I was putting chains on all four corners and towing 1-1.5 tonne trailer around in very steep tussock country loaded with tree seedlings. Diff locks were amazing for this. They do tend to encourage you to push a little bit further if you aren't careful, but I never really got caught out properly. I only got properly bogged once all locked in and that was trying to be a good samaritan and trying to snatch an old guys safari out of an estuary which he'd bogged to its door sills, it was soft as a chocolate pudding and even the tractor that came to pull him out had a hell of a job getting that safari out. I got myself out with a spade and a few manuka bushes to drive on.
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