I have a Travel Lite 800sbx 2006 . As for a whole, the TC has been ok, nice inside and no problems with inside stuff. I have had a couple of leaks but hope I sealed them . One was troublesome on passenger side wing where the jack is mounted .After a hard rain it was always wet inside where the dinette cushions were. I caulked and caulked. I even called to talk to someone at Travel Lite but he acted like I had a antique,suggested I buy a new one. I finally got the leak stopped.
Sounds like a quality control issues with Travel Lite. I have a friend that bought a new TT (not TL) a few months ago and had leaks in the water system. he fixed all of them himself because he was taking it out camping. For the most part the RV industry needs to step up and do a better job in quality control!