Thanks all. Install is being done by Hawkes Outdoor, San Antonio. The above answers are all consistent: Tailights are a combo of incandescent (turn signal) and LED (Brake). And as mpcraven notes, the LED harness comes with the kit as default. So, should be good to go.
Apologies if this is answered elsewhere - I did a search first.
Just picked up a ‘25 Lariat 2.7L and will have a RSI SmartCap EVOa installed Friday. Going through the install instructions Found here it references the harness is for LED and requires a separate purchase for incandescent tailights...