I just got an answer back from the dealership and they’re saying the trucks equipped with outlet have an inverter in the cab (I never would’ve thought) lol. Said it would be quite expensive to add it all. And they don’t feel comfortable “hacking into the electrical system” In other words they don’t want to do it as it’s extremely easy to hook an inverter up. The difficult part would just be running the wires throughout the truck. You can buy the receptacle and an aftermarket inverter and wire it up yourself if you’re up to the task. I will be doing this in the future sometime.
heres the link to the receptacle
https://www.gmpartswarehouse.com/oem-parts/gm-power-outlet-84240116?origin=pla&gclid=Cj0KCQjwoub3BRC6ARIsABGhnyaWxQ16kPc59FE2gl6Cr1ro8hOZKrrGRZ8SCzQlFs3YXO4klceyJ0QaApp0EALw_wcB