OK so further research finds Mopar has the separate wiring harness available for $487.
ARK have a universal kit for about $150 that you splice into your wiring but they say not for Canbus systems.
https://www.arkcorp.com.au/product/ecu-harness-kit/
Are ours Canbus at the tail lights where you would splice into? I'm getting feedback from installers that they use these with no dramas on Gladiators.Not being much of an electrician can someone confirm that it's feasable or not?
I'm also informed that if done correctly it should not affect warranty ?