Ah, to be honest I don't think I've had the engine temperature screen on when heavy towing on an incline ( the reason being when towing a big load of horse hay the wife is usually with me and plays about with the audio screen annoying me with her taste in music [ word used loosely)but will see next time I tow. When I have had the temperature screen on the engine has never been above 101°CObserve the same for the (displayed...) water temp.
What does your engine oil temp do when towing heavily (long steep inclines) in hot weather conditions? Mine quickly exceeds 130°C if I don't cut back.
I strongly doubt this was the case when the vehicle was new, but cannot prove it.
I asked for other's experience on several occasions here, but obviously there's no similar experience...
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