Guessing this is a 2019 Ram 1500 Classic, not the new body style, correct? If so, sadly yes, the cooling arrangement of the radiator, intercooler, etc is less than ideal with not much in the way of fixes available. However, the good news is that there TONS of guys towing more weight through mountains and, while they have the same issues, there really is no damage done so long as you keep your revs at around 3K and take it easy. More good news is this is, in my opinion, the only weakness of towing with an ecodiesel.
^^ what he said if this is a '19 Classic
When towing on the heavy side it's normal to see coolant temps in the 220° range and oil temps in the 230°-250°F range. The transmission usually won't stray too much above 200°F, if it starts spiking above the coolant temp there is a problem most likely with the TMU.
There have been lots of miles towed by members on this forum within those ranges, the trucks are still rolling down the road.
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