Are there travel trailers built to full time in?

The Airstream Classic series is marketed as a full time unit. They are very expensive and smaller than a 5vr. We have a 30ft flying cloud and it is perfect for us in terms of size. I would full time in it without hesitation. All depends on what you want and how strong of a relationship you have with your better half....LOL. Sometimes more space is a good thing. With that said, I spend more time outside than I do inside so....don't need tons of space when traveling.