I put one on my 2006 when I bought it new. Over the years there have been areas where the topper has rubbed against paint. I'm sure there must have been some kind of protective foam piece around the inside edge but the damage is done.
Love mine, I'm 65 and can still remove and replace by myself.
1. Release lower end of shocks and place into built-in clips on underside..
2.Close topper and remove pins or clips that are holding the next to cab tabs.
3. Slide each side up and off each tab.
4. From rear of cover pick up end and slide towards you.
5. Find a good balance point to get under and totally lift the cover and place aside. Install in reverse order.
The place where I got mine sold me some "silicone spray" stuff that was for shinning it up. At $12 a can I decided to just buy a cheap $2 can of silicone. Bad idea. It turned the black finish of the topper into a chalky looking mess that I've yet to figure out how to remove. That was 8 years ago! I just live with it.
Great secure, weather proof cover that is strong enough to stand on if necessary.
Enjoy your ride.