Sometimes it's not as sinister as some of you make it. Did you watch them mount the tires? Did the same guy mount all of them on the same machine?
The tire changing machines have built in gauges that get beat to death every time they flop a tire down on it. One gauge could be different from the machine next to it. Maybe two or three guys mounted your tires.
I just don't see this as an issue. As a matter of fact, it's something that any RVer owner should check after having new tires installed. Lastly, I bet it took more time to complain about the air being wrong on here than it did to just correct it.
Of all the issues with quality control in the RV industry, is this really a problem? When I get new tires, I tell them what I want and then set them with my own gauge when I get home.