This is just me spitballing, but since RV manufacturers are getting hit yet RVs are still selling sounds to me like everybody's buying used.
And the trend does not surprise me one bit. There are a lot of us that have never fully recovered from the great recession. Me being one of them, and that had a lot to do with me becoming a full timer because it's so much cheaper to live this way if you do it right.
I am seeing more and more full timer nuclear families with 2.5 kids and a dog in units they just purchased that are 3 or 5 years old.