A few weeks back I passed an Allegro Bus on the interstate, it too had the big crack at the bedroom slide opening like our friends Bus had. After the failure of the last factory attempt to fix thiers they finally gave up and traded it.
The '04 in question probably has the wet bay issue - like one of the many issues my parents had. The factory fix didn't work on that either. When they sold it you had to close two of the basement doors together, as unless you lined them up and closed them at the same time the sagging overlap wouldn't let them close.
As I've said time and again, many people like their Tiffins - I am not one of them.
I'll also say Tiffin does a great job of glossing over the issues with their customer service. To this day Mom would tell you what a great MH thiers was - she was never the one working on it. :W
They obviously must be doing something right as they sell well - then again Alfa sold fairly well too.