Aside from your posts, there's only one thread specific to the Cougar 302RLDS & not much info, unfortunately.
This model was discontinued at the end of 2007.
The owners manual is generic, not brand/model specific, so it won't give details about your trailer.
The 2007 manual is no longer archived on the Keystone website, but you can read the 2009 for reference.
See the "Owners Manual" Tab near the top of the page.
Here's a 2007 Cougar Brochure (from the archives)... it shows specs, features, insulation & etc.
The *Polar Pkg* is (for the most part) a marketing catch-phrase... every RV brand/line & manufacturer has one.
It simply means that the trailer has X insulation factors (as per each model year & line/brand) and there's typically
one small heat/vent which blows some warm air into the covered under-belly when (and only when) the furnace is running.
Yes, it "implies" that the RV is designed to with-stand extreme winter weather [like a house], but... it's not!
As for appliance info, you can find many of those manuals online, at each manufacturer's website.
If you have any questions, just ask, there's lots of Cougar owners [past & present] on the forum, plus the same
brand of appliances are used in many of the Keystone RV's & industry-wide.
Hope this helps,
Terri, the Chevy co-pilot