Two years ago we purchased a used 2010 Dutchmen Lite. This was back in the trailer industry merge days and Thor Industries bought it and several other brands.
Not knowing the future of the Dutchmen brand we decided to purchase the deluxe package of RV insurance and we knew the dealer was reputable. I assume Dutchmen TTs are still in business as they are listed by Thor and have a very nice website.
Maybe it was just luck; but we towed 8000 mile last year and spent 14 week on the road with no difficulties. I attribute this to the fact that I bought the expensive insurance. :B Also, we figured that any major problem would probably have if developed in the first three years.
Buying used definitely save money but it is also the luck of the draw.