I was able to find a piece of expanded polyethylene foam in white that was approx 2" thick. I cut it 1/4" wider and longer than the opening and tapered it inward to follow the profile of the opening. I backed it on the sun side with self adhesive duct wrap(or reflectix) and stuffed it in the opening. I did the same thing for the 3 roof vents. It works. The velcro idea might not stick to polyethylene but another poster was indicating he used screen clips and rotated them to hold the "plug". Since mine are slightly larger than the opening, the compression of the foam holds them in. I was able to easily cut the foam with a sharp pocket knife
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2016 Flagstaff 27VRL Emerald
14K Equalizer
2020 Silverado 2500HD CC 4X4 6.6L gas 3.73
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