I have one with 330k still on its first clutch, I suppose about 30-40% was @ 6 ton with 2 ton of trailer behind it over Cape York roads.
Issues so far have been,
Selector cables for transfer case rubbing through on front cross member,
Use of non genuine wheel cylinders lasting less than 40,000klm.
Anyone who doesn't use ****** bearings in the rears needs to reconsider, they are the only bearing that i can repack at 40,000 and then replace at 80,000 (klm)
genuine air filters are the only ones i've found that work 100%. A Donaldson pre-cleaner helps if you do sever dust conditions.
Clean the A/C pre filter every 20,000klms, otherwise you'll be spraying coil cleaner in your Evap to get the dust out.
Hinges on glove compartment are useless, sailtape is the best I've done so far.
Chassis cracks, not too much you can do if you drive them as hard as we do.