We are looking to upgrade as soon as our place sells to go full timing. We have been looking for a couple of years and some of the fivers that we like are the Elite Suites, Hitch Hiker and we are leaning to the Carri Lite because of features and a decent dealer. The Torrey Pine is another one that we like. I am trying to get as much info as I can because I have to get it right as we won't be able afford a quick turnover if we get it wrong. A major concern for us is the true insulation values as we will have to spend some time in minus zero temperatures. As mentioned above frames are a major consideration. Friends have a big tri axle unit that has bells and whistles but if they are not parked absolutely perfect the slides will not operate plus they have a lot of slide alignment problems. To a large degree the old adage you get what you pay for holds true. That being said I find that a lot of RV sales people are like truck sales personnel, they don't know squat and cannot be trusted. I also watch the RV business reports etc. as I would like to get our unit from a company that is going to be in business after we buy.
Carriage's "Carri-Lite" is not a fulltime unit. It is an entry level model of a good manufacturer and although it "looks good" it is not well insulated.
I have a friend who owns one that is like-new although it probably nine or ten years old. For his own personal reasons he hasn't used it much in years but has told me several times it is not comfortable in cold weather.
The same goes for the low end model of any manufacturer. Common sense should tell us there is a reason why the lowest priced model is cheaper to buy than the premier models.