My 2015 Tahoe did not include the bluetooth for phone option. I was wondering how difficult it would be to add it. Is it feasible to add it after the fact? Is it just adding adding or swapping out a radio module (like on some Chevy Equinoxs)? Does the steering wheel have the correct wiring already? It looks like I should be able to pull off the cover where the phone buttons would be and snap in a new module.