While my TT is a Springdale not the Cougar they are very similar in design and layouts.
About the slideouts, when we bought our 2011 this past may it came with a set of support stands for the slide out, I asked on forums and even called Keystone customer support to ask about using them.
The answer is do not use the slide out supports, but if you have your TT on a site longterm you need to run the slide in and out every week or two to keep everything in working order.
Phil & Alberta Saran
2015 Thor Hurricane 34E with V10
2011 Dodge Dakota 4x4 towd