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G’day @YeatyGU Mate
In my honest opinion, having flogged towing the death out of quite a few TD42..&T’s (work & family nag float stock setups say :-) their downfall outa factory has been airflow & weak viscous coupling longevity.
Clean their radiators & a/c condenser’s for full frontal air flow and be sure your fan oem or aftermarket is locking at 100% when under duress.
Mountain truck climbing wise at under 10kmph is where higher flow idle rate water pumps and elecy assistance fans come into hard play IMHO.