Understood - just saying it's not going to be done by an average or even above average mechanic and nobody would recommend pushing them to double + service limits on a rig like this if you are truly driving it in remote areas....you'll want to stay on top of recommended service intervals, or at least I would. I'd also think a rig possibly driven at high capacity, in loose soft sand other other difficult conditions, would put even more strain on an engine given the engine was designed and is used in lightweight road cars vs a heavy offroad vehicle.
We must know service requirements by now? People have them....what does Ineos say?
Tuning the engine to meet the service needs of Grenadier is a given. We aren't talking about a Beemer built for the race track here. Detuned for high torque will mitigate a lof of concerns with wear and tear on the motor IMHO.