Yes NEW units can have troubles. BUT IF you choose your dealer wisely. They will fix what ever is wrong in a timely manner. they don't want your RV sitting on their lot either.
I have bought several used units, and 3 new units. Trust me when I say. You get what you pay for. Every new unit I bought had some problems. One even recalled. The dealers I chose took care of my problems no questions ask. I just dropped them off. Left a list of what needed to be fixed, and a week or so later. They called and said its ready come get it. Why? Because they want to sell me another one someday, and they know that I will tell my friends about their service after the sale. One dealer even sent me a fruit basket, and called to see IF we were happy with the TT.
IF your dealer is NOT taking care of you after the sale. You picked the WRONG dealer. Bottom line. And BTW. IF you fix anything yourself. You void the warranty.