Diesel owners are wary about shutting down their truck when components of the drivetrain are overheated.

Would you mind detailing when and which drivetrain components need cooling down before shutting down the Ram 1500? For instance I don't always complete the active regeneration cycle. Sometimes I run the truck until the DPF is at 60% or less and then idle until the regen message is not displayed. Also I rarely tow but would the turbo need a cool down period after extended highway miles?

The description of your tune suggests that at times the cooling fan is programmed to run after shutdown. When would this happen?

Ustuplay,

There is never any need to let the engine of the DS cool-off before shutting down - just drive it normally and shut it off when you reach your destination.

If the ECU does sense that something is too warm when shutting down, it will run the cooling fan for a prescribed amount of time.

For regen conditions:
1) Regeneration was active at the moment the key was switched off; OR
2) DPF Inlet temperature above 450°C at shutdown

Heat-soak back conditions:
3) Turbine inlet temps above 775°C for more than 4min consecutively before shutdown; OR
4) Coolant temps above 113.5°C before shutdown

The regen conditions are newly activated with the GDE Tunes. The heat soak back conditions are part of the factory tune and were instituted in order to meet the qualification requirements of the turbo supplier before production.
Continued idling will accomplish little more than throwing away some fuel.