Newbie looking for Travel Trailer Ratings

RV manufactures create and kill brands and models very often, as well as change suppliers of components in model lines and make 'tweaks' from year to year. I think that makes it very difficult to find accurate information on quality, each RV might as well be a unique snowflake.

My parents have had 2 Airstream TT's, one a 1949 and the latest 1978 model. In between those they've had several others and were never happy with anything else... I'm sure that there are complaints about Airstream as well (besides the price ;-)