The company who did our pressure test used the "pump/blower from a "Jumpy House." they didn't remove any vents as the rig they developed fit over the top of the roof vent with the vent open. The unit had soft material that made a good seal but I don't know what pressure in psi it accomplished. What it did accomplish was show us several leaks at joints and seams and windows. After the joints were sealed it still showed "bubbles" at the rear window. Still working on those leaks caused by poor workmanship on the part of the dealer, not Airstream. This is on a 2015 25'Flying Cloud FB.
"You know what we have right now? We have right now!"