Wander around a CG and ask a few people about their particular brand of TT. You'd be amazed at some of the stories you hear.
For ex., spoke to one couple who had bought a new TT for their retirement years. Roof leaked like a sieve from day one. They took it to the dealer who could not fix it. Then it got sent back to the factory and they only made it worse. He ended up fixing it himself. Brand name withheld...
Thing is about TTs, is that 99% of them use the same components - appliances, doors, converters, toilets, frames, etc., etc. and same materials like luan, vinyl flooring, etc. It comes down to how well they were assembled at the factory and how well the manufacturer & dealer honor and support their warranty. The "quality" of a particular dealer should also be considered. Our last one was useless and even fraudulent. Look for a good one...
If we ever buy another TT again, it will not have a Lippert frame and will not be made in Indiana. Outdoors RV would be my first choice. Jayco has had a reasonable reputation for some time and they have a BAL frame.
TT quality is a big problem in the industry. We had one that got replaced under warranty after we discovered frame problems the day after we owned it. Our current TT has had ongoing poor workmanship issues, and even now, into our 6th season, am still finding problems to deal with.