Does my 05 Durango have built in trailer brake controls or is there a wiring plug to plug a controller in under the dash? It does have a factory tow package.

 

My 2005 Durango with the factory tow package has a connector under the dash, on the firewall. In a plastic bag in the glovebox was a connector with wiring that I used to splice into a trailer brake controller. If I remember correctly the connectors were blue in colour.

If you don't have it, maybe the dealer can get you a replacement.

Jeff