Just picked up my new (to me) camping trailer tonight. The trailer has built in brakes and I know I need the control module that mounts to the bottom of the dash. Did the LX come with a trailer brake wiring harness? The guy I bought it from had been towing it with a 2011 Tacoma that had the wiring harness installed from the factory and he thought there was good chance I would just need the actual module and pig tail to plug it in. No need to run any wires to the back. Is that correct? I have the factory tow package/7pin plug and all the lights work correctly. I just want to know what I need to make the trailer brakes work.