You could try 3m spray adhesive, it works well, but you'd have cut the ceiling carpet next to the sag to properly expose the underside, and prep the surface, as the adhesive needs to be sprayed on both the ceiling and the back of the carpet, and left to get tacky before you press it back up. I've used the 3m product on the head liner material in my transam, its a good product.
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2001 National Tradewinds 7372
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