I know you can get the HD mirrors with the same option as the standard 1500 but good to know about the wiring.
Boost Auto show a set of 1500 power fold in developing with the same option as OEM so I guess I’ll just wait to buy those.
https://boostautoparts.com/pages/product-result?from=homepage&collection_id=282071466143&rq=th_gmc~yr_2021~mk_sierra-1500