Pictures show the first set up, that worked well at home, and then the final install that I used for the first trip.
The a/c sits atop a Home Depot cabinet. When traveling I secure it by running a bolt through the slider into the cabinet top. Then I add a non slip matt under the a/c and finally secure it with my extra cargo straps.
Everything worked super the first trip and I towed the camper almost 800 miles roundtrip with no problems.