Well, there is more than enough evidence from many members, including me, that the engine will easily climb up to 110°C. under heavy loads and high ambient conditions (95°F.).

So, what is you basis to conclude that it won't reach 120°C. if the load is maintained for sufficient time?

David has already confirmed that this occurred for his vehicle.

Others have backed off the power at 110°C. to prevent the engine from reaching 120°C.

Your only basis is to conclude that all of these cooling systems are not in acceptable operating condition. On that point, I don't agree.