Pretty good job on the new deck!
I'm a big advocate of doing the pressurized test and I'll share what happened to give me that outlook.
I totally gutted and rebuilt my TT (the restoration thread is linked in my signature line). When I reassembled the ceiling, walls, and floor I took a lot of steps with sealing everything I could. I put elastomeric sealant between siding and framing, between the siding and trim pieces, on the roof to the trim, and on siding to trim. In the first few rains I spotted a couple of drips of water entering the cabin. I put a blower into a window and performed a pressurized test. I discovered about two dozen holes. I sealed those holes and retested, got about six holes, all in the siding. Sealed again and only found a couple. I now perform this test about every other year and am not finding more than one or two leak points, mostly where caulk has loosened or a siding joint has loosened. I never see any water inside and that is a good thing, I don't want my hard work to be destroyed.
Good luck with your new trailer. I'd suggest to do the pressure test to uncover those spots you can't see and thought were water-tight. BTW, if you do uncover a roof leak, Eternabond tape is all that is said good about it. It is basically, a permanent fix.
