I'm also hoping for a slide-in for the Gladiator; dust is one reason, the other is I need my truck to do truck things. That means being able to jack a slide-in out and leave it on a parking spot next to the garage when it's not in use. I'm not a fan of keeping an open-bottom topper outside; so a slide-in is where I've landed. Right now I'm leaning towards RoverKing; all aluminum, under the weight capacity of the Gladiator with room to spare, pop-top to keep it low profile on the road, and I can keep the tailgate in place with my center brake light and reverse camera.