I have a Hemisphere 312QBUD in nearly the same boat. The frame is twisted went to Indiana last for evaluation and repair after I brought my lawyer into the process with the Dealer Service tech who went through service manager, gm to dealership owner. After some words with owner on customer service he is my point of contact for now.
The key was my lawyer. The Lemon laws of the US states repair things such as repair attempts. In this case it is just getting them to step up to the plate. Lemons laws are on the manufacture. There is actually a more powerful legal tool called UCC Article 2. In this law that is universally accepted in most States allows you to with out a lawyer write a letter to the dealer that states they have never delivered a fully cured product and that you can return it. Other details in the letter are needed, but effectively you can return and cancel the sale with full refunds. So the dealer is then invested in the fix or lose the sale and be stuck with it.
This link is a bit over my head in legal jargon and there maybe short forms for just this purpose.
It appears we are not clear on the terms your issues nor their responses, but it would seams to me that maybe they are all just baiting you to return it and everyone move on. UCC Article 2 allows you to do just that. Get your money back and order another TT.
And just for reference this same floor plan is available in a dozen brands in Forest River and Keystone. They all list for $32-43K but know you could buy one delivered for less than $28k.
I will have to share the pic I have of the frame twist. I am close to just moving on, but feel stuck in the rut of poor quality and riding it out is the game at the moment.