Congratulations on your new Cougar and welcome to the forums.
About banging your head on those slide outs. I'm assuming you are talking about the outside. I had the same problem with mine. I finally took the advise of years and years of previous forum posts that suggested taking swimming pool noodles. Cut them in half so they are a bit shorter, then slice them down on one side like hot-dog bun. Then simply slide them on the edges of your slide-outs. Now, when you bang your head, it doesn't hurt or scar up the top of your head.
I did this for a while and realized they filled up with water when it rained and would fall off. I ended up putting them on the edge of the slide up, vertical (up and down) and actually leaving them hang down a couple inches below the slide out. Rain now runs out of them, instead of pulling them off because of the weight, and because they can now hang lower, they get my attention easier. I can see them, reminding me there's a corner there.
You might try something similar.
Noodles horizontal. Works well, but problem: They fall off when it rains, and still have a tendency to brush my head against them. But they do prevent getting banged and leaving head injuries.
Here they are in the vertical direction. Works much better. They do not fall off when it rains and because they hang vertical, the "tail" can be lowered below the slide out, making them more visible, then preventing any brushing of the head or hitting them at all.