I believe I have found the helpful article section you are referring to and have attached a link towards the bottom of this answer page.
For your 2015 Jeep Wrangler Unlimited the Etrailer Preferred parts are the following:
Roadmaster Base Plate Kit - # RM-521448-5
Roadmaster Nighthawk All Terrain - # RM-676
Hopkins Custom Tail Light Wiring - # HM56200 (cut off 4-Way connector and wire to tow bar connector)
Air Force One - # SM99243
Tow Bar Cover - # RM-055-3
Brake-Lite Relay Kit - # RM-88400
Tow... view full answer...