You can download the 2018 brochure for any of the Keystone trailers at this link:
https://www.keystonerv.com/brochures/ You'll be asked if you want a dealer to contact you (mark yes/no) then you'll be asked how you want to brochure delivered (mail/download) Click download and it will "magically appear"....
There is a "situation" with the brochure for the Montana High Country. It has the same picture, to describe the air conditioning ductwork, as the brochure for the Montana. That picture shows "aluminum rafters". Then further down, in the chart that shows the build features, the rafters are listed as, "RESIDENTIAL ROOF RAFTERS". In the Montana brochure, the same picture appears in the description of the A/C ducting and the construction features in the chart indicate, "5" ARCHED ROOF RAFTERS".
While the difference in how the rafters are described in each brochure may mean they are not the same type/construction it doesn't mean they aren't. If I were you, I wouldn't rely on the brochure as the "verified source of information" for any trailer. The last statement on each brochure reads: "Product information is as accurate as possible as of the date of publication of this brochure. All features, floor plans and specifications in this brochure are subject to change without notice..."
So, the brochure may not be accurate per Keystone's disclaimer.....