I do remember seeing an old scan of a sales brochure, unfortunately I can't seem to locate it now. It resided on my hard drive, but a search hasn't turned it up.
It listed the three models in a table format.
The 'Spirit Wing' models were one step up from the Deluxe models and had just a few more luxury options. I don't think there were many ordered that way as the Deluxe model already had most of the options over the standard models. I can't recall what all the options were, but I believe there was a privacy curtain around the rear bed area, an upgraded awning
style, and a few more upgraded options. Maybe a bigger fridge
? Sorry I couldn't find the file.