I think you are asking about the solid, plastic+metal cover that mounts at the top edge of the slide, not on the RV box, right? Such that when you are driving down the road the wind cannot catch the rolled-up topper fabric and unravel it as you drive 62 mph down the highway, right?
I would get them. At the very least, it's going to save you frustration and keep your toppers from whipping and fraying in the wind.
\ken
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Ken, Deb, & Gadget (WIT Club, FMCA, SKP, and grateful volunteers with Habitat for Humanity and SOWERs), traveling in a well-behaved 2005 Winnebago Vectra 40FD w/1100w solar, some gee-golly-whizbang, and a TRAILERED 2015 Cherokee TrailHawk toad.
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