[wingnut60]

Tetons were for many years considered the 'Cadillac' of fifth wheels trailers, and being built in Casper, WY, they knew how to insulate them. Biggest drawback, they were VERY heavy for length and early duallys were hard-pressed to handle them. I believe they went out of business in the 2008 downturn, or maybe earlier. Things just happen. I saw a lot of them being used for housing in the oilfields up in Wyoming, and many wintered in them.
As Glenn has said, they are well built, but if you are concerned about weight, then they aren't for you.
There probably weren't enough Domanis built to have a real following, or a forum that can be of real help in evaluating a used one. And, they were an odd design for the time--there was also one from Canada? that had an 'aerodynamic' look that also fizzled. Sometimes odd is not successful, but doesn't mean it won't be a good unit.
The real choice is yours in whatever you end up with--used units can have problems no matter how nice they look--or they can be a great buy.
Cheers...
Joe