I have opened up most enclosed areas of our 7 month old 2018 Wildwood 26 foot TT. Sawdust ragged cutouts, half staples, missed screws The fresh water intake did not work so I took the undersink area apart and found that the fresh water inlet hose to the tank was installed with more uphill than down, no wonder the tank would not fill
I have to agree that there is NO QA or sense of the workers doing a good job putting these TT together.
I did not spend a lot on mine, because of the exact reason you stated in your post. I have spend many hours in the "NEW" TT to fix what I have found not to be correct, and now I'm going to enjoy the unit.
I really know where to look when it comes time to trade for another TT