Have you seen the pics of the EcoBoost racing engine being run on the dyno? THOSE will scare you. The exhausts and turbos are so red hot they are almost transparent:
I too have wondered about the turbos after pulling my 28 foot TT up a mountain pass, as you know they are under full or near full boost the entire time.
The one thing I would not do is pull over and turn off the truck right at the top of the hill, unless I let it idle for a while before doing so. While this is probably not necessary, it is peace of mind for me.