According to a Certified GMC Tech I checked with, your 2020 GMC Sierra will not register the towed miles if your dashboard is not "live". Meaning, if you do not have the ignition on or in the accessory position when flat towing there will be no power to the electronic items that register the rotation/movement of the wheels.
To flat tow your 2020 GMC Sierra, you will need a base plate kit, tow bar, safety cables, a lighting solution, and a supplemental braking system. If you need some... view full answer...
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