I just posted in another thread about my experience. My 10/21 build came with both sensor and 5-6 stickers. First box trailer went great and I use it all the time. Second smaller trailer I installed the sticker only since I read that it generally it is one OR the other. BUT... pushing the button...
I added my big box trailer to my Limited (10/21 delivery) using the sticker and the sensor (both came with the truck). No issues and I use it every time I tow.
Adding a second trailer, I used the extra stickers that came with the truck, but no extra sensor. Guess what! Push the Pro button and it...