the locking rear differential is turned on/off with a dashboard switch.. only works under 20 mph. great in grass and new blacktop. :)
hill descent uses the anti-lock braking system. forward or backward.. from a stand still. does NOT turn OFF. my understanding.
I am sure you will love the truck. Have Fun Driving.
and the tow/haul is great towing Heavy. upshift later, downshift sooner.. and you can lockout upper gears.. on the fly..
and going down long grades.. Appling and releasing the brake petal.. and reapplying the brake will automatically down shift 1 gear. Computer controlled.
my truck 2012, did not have hill descent...not available.. but does have all the other stuff.