Ok. I asked around and here are a few things to try and make sure of.
1. I assume you are selecting your trailer profile at startup and not changing any the of the dimensions. If you change any of the dimensions it will cause you to re-calibrate.
2. Just confirming that you are getting a yellow status bar and showing calibration being done on the Transparent view after each startup? You have to be going 10 mph for the transparent to work after a key up.
3. If it is really calibrating after each key cycle, I was told after the calibration is complete and transparent is visible to shut the vehicle off and let it the truck go asleep. Basically, shut the truck off and open/close driver's door and wait until the Onstar green light goes out. From your post, this should have happened at your gas station and food breaks. When the module goes to sleep, it should write the calibration values in memory.
4. Its probably worth trying creating a new trailer profile with the same dimensions and see if for some reason that profile is corrupted.
5. Take some pictures in transparent view with it calibrating and once the calibration is complete. If it is calibrating, in the transparent view you should see the view with the two mirror cameras with the trailer camera in the middle with a yellow status bar at the bottom of the screen.
6. Take to Dealer and see if there are any codes for loss of communication between the CSM (Radio Display module) and VPM (Camera module).
#iworkforGM.