My floor sighs and groans, particularly right in front of the refrigerator.
I think it is something that Airstream does intentionally. It's as effective as paying for a membership in Weight Watchers.
I took mine back to the factory twice for repairs last year. The first time they put extra insulation in, which didn't work. The second time, they sent one of their skinny service guys to look at the supposed problem together with me, and of course it didn't make those groaning sounds from his malnourished weight.
That's when I knew they intentionally build Airstreams with regrigerator raid radar detectors.