I'm not sure why that info is important, but in 2004 the Discovery was pretty much the mid-entry in Fleetwoods diesel family. Bounder and Expedition were below it in trim & amenities, while Excursion/Providence ranked above it. And Fleetwood's entire American Coach family of models ranked above all of those.
Generally, the starting MSRP will tell you where the brand ranks.
It seems tome it is far more important to find the brands that have floor plans and amenities you like and then decide what price level you can afford in that group. The models that were originally higher priced generally have more features and better quality under the covers than the cheaper ones, even if they have the same visible "bling" items. You can view MSRP ranges for older models in the NADA.com RV Guide.
2004 American Tradition; 2014 Buick LaCRosse
Homebase in the Ocala Nat'l Forest near Ocala, FL