Finding dual pane windows on a used motorhome

Empty Nest, Soon wrote:

Trackrig wrote:
. . .
I'm not sure why you're looking for them as an "option" when they are available on so many MHs as standard equipment?
. . .

I've spent many days searching old product brochures on-line and compiling a list of MHs where dual pane windows are standard. (I will be happy to share if anyone is interested.) Some product brochures, especially earlier than about 2000, are difficult or impossible to find on-line.

In summary, there are a number of Itasca and Monaco models which have it as standard beginning at least as early as 2000, Holiday Rambler starting at least as far back as 2001. Winnebago seemed to phase it in starting in 2004 - 2005; Newmar from 2003 to 2006. Plus a few other brands/models.

I believe ther are some niche brands, such as Barth and Foretravel, that had dual pane as standard equipment at least back to the early 1990's.

I'm trying to figure out whether I have a sporting chance of finding dual pane on MHs where it was an option, or if I will save time and bother to limit my search to brands, models, and years where I know it was standard.

Wayne