My first camper didn't have a slide topper, never again. I had the ones put on the Windjammer at the dealership before I picked it up.
Our first was an Outback, and the bed was the slideout, and it got hot in there pretty quickly during the day. And all the dirt, pine needles, etc were a pain to clean off before retracting it. Even down south, I didn't notice a temperature rise in the slides with the toppers in place on the new camper. Live and learn for me.
2008 Toy Tundra DC 5.7L Bagged w/LTs
2012 Windjammer 3001W, Atriumed