In My Opinion there is no such thing worth more than a few dollars. Nobody actually buys & tests RVs, or even the popular brands or models. The cost and time needed would be prohibitive, and the standards are subjective anyway. Plus there is no tracking for frequency of repair or other objective measures of quality.
Former owner of 2004 American Tradition and several other RVs
Home is in the Ocala Nat'l Forest near Ocala, FL
Summers in Black Mountain, NC