This feature is mainly for motorhomes, especially if the fridge is close to the fuel filler door. I don't think Airstream has ever implemented the function in a trailer.
The feature works by having an extra electrical connection that is switched on and off by the vehicle ignition. In a motorhome, it is straightforward to run a wire for that purpose when the vehicle is outfitted.
With a trailer, the standard umbilical cord does not have a wire for this purpose. You'd have to run an extra wire, change to a different connector for the umbilical, or, if your trailer lacks back-up lights, rewire that line to be the switched line. Then you would have to run the wire through the trailer to the fridge.
I have considered a different approach, which would be to install a jumper inside the fridge compartment, connecting the regular 12V
to the terminal for the switched line, plus a switch. Then the function could be activated by hand. That would be easier than what we do now when we travel with the fridge running on propane, which is to turn off the fridge from inside.
By the way, we often travel with the fridge on 120V power from our inverter and 435 watts of solar power.