I just had my new 2019 Jeep wired up. I checked with Etrailer and they do not have a wiring harness for the 2019's yet. The one I had from my 2014 Jeep was not compatible.
I took it to a place in Peoria, AZ Quality Bumper and they made one and installed it for $200. I thought that was a very good deal. Works perfectly. They also told me the aftermarket harness was not yet available as well.
2017 Dutchstar 4369 Spartan Chassis, 2200W Solar, 1200AH Lithium Batteries, Active Air
2019 Jeep Rubicon, Roadmaster Sterling, AF1