Do you have any way to log live data?
I was pulling a UHaul 6x12 dual axle trailer with 2 motorcycles and some camping gears. Call it 3,000lbs all together.
Coming back from the race track I was able to monitor a few live parameter and going up the Tejon pass on I-5S (
https://en.wikipedia.org/wiki/Tejon_Pass) at 65mph EGT was up to right around 700C (that's right around 1,300F). No DPF regen going on.
I had the cruise control on and that was full boost, 4th gear, probably right around 3K rpm if I remember it right.
What kind of EGT you see when you put full load for some time? I know it's kind of an open question, but if you have some example to share I'd be interested.