I ran across a source for some of the Beaver and Monaco brochures. It is:
https://www.rvroundtable.com/wp-content/uploads/Monaco/
When you go here you can see a list of monaco coaches. Click on one of these and you can see some brochures. Not all years for all coaches are listed. But, it is a start and probably the only renaming source of these brochures.
I notice that the Roadmaster M10S chassis starts showing up with the 2004 model on the Patriot and the 2003 model of the Marquis. So, I would imagine that they were trying to designate the use of 10 air bags on these models. Or maybe try to create a similarity between the Monaco chassis designations and the Marquis designations.
Anyway, the "M" is Magnum.
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