I finally got it dialed in, and it works. The basics are in the below, but not quite.
https://app.hubspot.com/documents/22...ccessId=c2c22d
It makes a vague reference to all other measurements have to consider the trick on modifying the actual distance from license plate to ‘hitch ball’ (which you don’t have as a pivot point on a PP3). Wish it was more clear. I went on on measuring and adjusting the actual readings on the measuring tape with plus and minus the difference between the actual distance as measured against the 16 inches the author indicates should work. Wrote down, tried, crossed out, wrote down again, repeat, till it works, but I don’t know what are the final numbers I actually inputted into Backup Assist, no idea how to recover them from the car’s screen either, so sorry can’t be of much help, but I made it work, it can be done and is great.
Anyone with a better explanation of the process, please provide it. It is a great tool.