They are sold all over. I have the 198RD which is the Swift version of the 19RD (same floorplan) and we love it. I needed a full size trailer for the interior height but didn't want a monster trailer, so this was perfect. It will sleep 2 adults and 3 or 4 kids if you fold down the dinette and pull out the couch - all the benefits of a bunkhouse but multi-purpose use of space. It also has the same size holding tanks and awning length of the larger Swifts, and axles rated for far more than the trailer will ever weigh. It tows beautifully without sway control, and the hitch weight is reasonable so your payload isn't chewed up. The holding tanks are over the axles, which is also good for towing when filled. The large windows on every wall at the rear are fantastic for letting in lots of natural light and providing a great view when you're camped.
I don't know much about the Idaho plant though. If anyone has more info about it I would be interested.