Backing a trailer help

Well. . To be fair. .I DID read all 600 and some odd pages of my manual and I still had the same issue as OP. There's alot in there. Took me 10 minutes to back my trailer in a tight drive. .

 

So I backed up 3 different trailers a total of about 40 times over the last week (moved houses). As soon as I start hauling I turn on tow mode. Back up fine without any braking. Nanny beeping still beeps half the time but no brakes. Not sure what I’m doing different but works fine. Don’t have any trailers set up on the dash, I just turn the knob to tow.

 

Again, no skin in this game but I would think your issue was because you didn't use a large enough testing area to calibrate. Have you read the calibration with trailer section starting on page 394. It's one of the first suggestions to properly calibrate.

Not trying to tell you what you did was right or wrong but just based on what you told me, I can see how what you did contradicts what the manual is suggesting.

Edit: To also suggest based on the instructions, it says to not exceed 5 MPH during calibration and to ensure the steering wheel confirms alignment with the blue lines. I don't know enough of OP's issue but this was why following the manual would be the first guidance anyone can suggest and the reason why I even mentioned it. It's not a widespread issue if these are isolated events. Worst case scenario, take it to the dealer to ensure all sensors are operating properly.

 

still do this one the rare occasion i do pull a trailer, etc. i was taught to start learning this way until i mature(experienced) enough to learn how to use the steering like normal.

granted i only pull a trailer maybe once every few years at most. last tundra (2018) i only did it once in 5 yrs.

and i still use the bottom of the wheel to this day. i just dont pull enough trailers in my lifetime to get a feel to use the steering wheel like most full time trailer geeks