I bought a new to me TT that is in really great shape and had very few areas of de-lamination. I noticed that the dealer the folks I bought it from who they got the unit from a year ago, went over it ...
On my trailer i did the pressure test with it's own Fantastic Fan. Just set it to "in" position on high. Make sure all windows and door are fully closed, and watch for bubbles. Foumd some around trim on several windows. No idea how much pressure it generated, but it worked fine.