That's irrelevant: the specific concern is that AEB will activate, causing the truck to brake without braking the trailer. At best this could cause poor braking performance, at worst it could jackknife the trailer, etc. This was not a concern before AEB. (But, as I said before, I question how relevant this is in the real world vs being a "thing that could happen" that the lawyers told them to print a warning for so they can't be sued by someone being stupid.)
I got an AFN Rear Bumper w / Wheel Carrier and Jerry Can bracket for my 2020 Fx4. Hoping to mod the Jerry Can holder to hold my winch at some point so I can use it front or rea via the hitch receiver. The bumper had zero cutouts for any trailer plug. I measured the plug dimensions with a micrometer and made templates you might find helpful. I stuck the Overall template to the bumper to see where it would best fit. Options few due to structural elements behind the bumper face. Then I stuck the template with the hole cutout profile to the bumper and used a cutoff wheel and sawzall to cut out the hole. I had to trim off a little where the clips to hold the plug into the bumper landed. After polishing the edges to remove razor sharp places, I put black ATV sealant around the part of the plug box around the hole and snapped it in. Then got behind it to smooth the sealant around the hole. Very snug and solid fit.
