Definitely this …
You can drop $10-15K on that truck and still be ahead compared with buying a new or newer one. Even better when's it's free and clear, no bank note.
My usual rant will hit home even more since you have a ’13 Denali outfitted by the factory for future modifications they never implemented. Your current HDD Navi spanks the next Gen units. It currently has push to command control of Siri for iPhones so it will verbally read / write texts or any other command.
I) The BTdieselworks module that will add those future mods that include remote 24/7 rear camera in motion view access, remote and/or auto mirrors fold & window close, windows one touch down on all glass & up on d/s, emerg strobe of all lights, read/delete of DTC thru center console/DIC, an optional 100% reversible engine trans tune.
II) Crutchfield A2DP Music BT streaming module. It allows you to stream music or audio from cell. This means Waze, Google maps audio will mute BT streaming music to announce directions or traffic alerts, then music automatically resumes. Incoming calls pauses music & mutes Navi and still lowers hvac fan speed so you’re not talking over roaring a/c fans. It’s uses all the factory steering wheel controls.
III) VIM defeat / Vehicle in motion override. Enter Navi address, dial BT calls or select / view movies for 2nd/3rd row while in motion.
IV) OnStar access. Miss this? I’ll sell ya my Uber rare 3/4G Canadian/US o/s module that has $15 Mo unlimited WiFi & push to speak Navi directions into the Navi plus all the other usual o/s emergency features. Yes, it’s working OnStar for a 07-14 truck.