Anyone using a Andersen Ultimate on a 2020 GM truck?

I checked with Andersen about the bed support requirements for GM trucks. They told me specifically that the 2020 models were redesigned and did not require any reinforcement. I used a thin rubber mat under the AUH and when I removed the hitch and mat after my first trip. There is not a trace of evidence that the hitch has ever been in the truck bed. Doesn't the truck's gooseneck ball provide the bulk of the support?