[TKCR]

The tailgate trim comes off by taking the screws out on the backside of the tailgate. There are 4, maybe 5 screws.
The cab trim, you will have to reach up between the panels in the rear corner of the cab, behind where the rear speakers are if you have any. It is a 3/8th nut that hold the corner trim on. They will come right off after taking the nut off. then the long rear piece, just push from one side , it slides off the tabs on the back of the cab.
Not sure on the decal, but i would image it's held on by a nut also. So you might feel it when you reach up in there for the corner trim nut.