I recently purchased a 2019 sxt super crew with 2.7 ecoboost. It has the heavy tow option prewired for trailer brakes but no controller. I have read and heard conflicting stories about installing one and programming the computer. Etrailer says you don't via their tech staff. I have read both on here. Some say you do some say you don't. I could care less about the anti sway option in the truck since my load distribution hitch has one. So what's the truth about programming and using a p2 controller?