Dayton furnace blower, DIY manometer, ladder, piece of plywood taped in window opening:
In a 22' Starcraft, I was pushing 2" on the manometer. The commercial testers pull 1" or less so there was plenty of pressure. One thing I thought of in advance (not too often this happens, lol) was to sketch out five pages with all the sides, front, back, and roof. It then made it pretty easy to mark on the paper where the leaks were, go back and fill the openings with Geocel Tripolymer sealant (similar to Geocel Proflex). My experience, too, was that all of the Eternabond areas held without leaks. The one exception was the smallest of pinholes at the junction of two tapes. I rerolled that joint and hit it with a little sealant.
My pressure test turned up about 20 leaks. This was after completely reframing, restoring, and resealing every joint. A lot of the leaks were at corners, siding panel intersections, marker lights, and such.