Carol, I too am confused. Looks like they changed their information between 2007 (brochure) and the 2009 (brochure) and web site. I agree with your input for the 2009 brochure and current web site. Back in 2007, per the brochure (if that was correct) the Arctic package was an option. Thanks for showing me the update.
2007 Brochure
http://www.keystonerv.com/media/docu...Montana_07.pdf
2008 Brochure
http://www.keystonerv.com/media/documents/Montana08.pdf
I guess either way with the Arctic Insulation Package the (R) values are the same.
Roof R-14, Wall R-9 and Floor R-21
Bob