Teton Homes/ New Purchase
Tetons are built by Teton Homes in Casper, Wyoming. They began by building trailers for construction workers who had to stay in a trailer in very cold winters. They were the only company who would guarantee that no plumbing would freeze as long as the trailer was kept warm enough to live in. They were first to offer things like inclosed holding tanks and heated plumbing spaces. And they are designed to hold up with constant travel. But, they are also very expensive and they are very heavy, as most of the better quality RVs are. Today, Teton builds what is probably the largest and most expensive trailers.
Some others that also have a good reputation for quality, if not quite what Teton builds, are Travel Supream, Hitchhiker, and possibly a few others. But most of them are heavy. Weight is a key concern for safety. Studies show that more than 60% of the RVs on the road are running overweight. I have also read that at least one small study was done that showed that far more over weight RVs find themselves broken down along the road, but I don't recall exactly what the numbers were.
The key to this purchase, like any major one, is to do your home work. If you just ask on a public forum, don't be surprised if you find that you have made a terrible mistake once you buy. But if you take a lot of time, do a lot of study and then make your purchase, you should be able to find one that will fit your needs and be reasonably priced.