We want to buy a small travel trailer to tow behind our 2016 Ford Explorer with tow package and 3.5L V6. I need to add an electric brake controller. I know Ford has an oem controller that plugs into a plug under the dash. They tell me that then Ford has to program the computer to recognized the controller. There are several after market controlers that have adapters that plug into the under dash plug and then into the after market controller. My question is, do you still need to have the computed flashed to recognize the after market controller?