I am currently looking to buy a true 4 season TT. So far my research has turned up the following: I am leaning toward Northwood Arctic Fox or Outdoors RV TimberRidge & Creekside. Also Evergreen's Everlite is well insulated, but maybe a tad below ???? the A/Fox & ORV units. I live in Pa. and have an A/Fox & Everlite dealer about 100 miles away. After I have look, I am planning a trip to visit the Northwood & ORV plants in Washington before making a decision. Perhaps will purchase out there & bring trailer back. Lance trailers are not quite as well insulated, and are a little pricey for what you get.