On the 2020 Ford's, it is recommend to hard wire the light bar directly into the tail lights. You should not tap into the 7 pin trailer wire harness as these trucks will defect an increase in voltage use and will defect a trailer connection/ trailer disconnection.
below are the correct wiring configuration for 2020 Ford F150, F250.
Power - Tap into your 7 pin trailer wiring harness power wire (Orange)
Ground - Tap into your 7 pin trailer wiring harness ground wire (White)
Left Turn Signal - Tap into your driver side tail light wiring harness (Gray with Orange Tracer)
DRL - Tap into your driver side tail light wiring harness (Blue with Gray Tracer)
Reverse - Tap into your driver side tail light wiring harness (Green with Brown Tracer)
Right Turn Signal - Tap into your passenger side tail light wiring harness (Green with Orange Tracer)
ABOVE IS AN IMAGE THAT DESCRIBES WHICH COLOR CODE FACTORY TAIL LIGHT WIRES YOU TAP INTO.
*keep in mind, the wiring diagram shows for F150 and F250. Make sure you follow the correct one including if you have OEM halogen tail lights or OEM LED tail lights*