buying an orphaned brand TT?

Probably the biggest issue you'd have is the factory warranty (there will be none). However IF you are purchasing from a dealership they MAY offer you (or you can bargain for) a warranty based on that dealer doing/paying for warranty work. Of course if you have a warranty that is only valid while you are "at home" then it's not worth all that much if you travel with the RV. It's rare that something breaks while sitting in your driveway but guess some things that don't require immediate attention could still make it worth negotiating for. You would be put in pretty much the same position as anyone buying a used RV though. It's current condition at the time of purchase would be far more important that it's record but the brands record should be considered when making the original purchase and appropriate discounts applied but again you'd need to negotiate those discounts in all probability.
Good luyck / Skip