Have you called Thor and actually priced new covers? When I had the problem on my Fleetwood they said they couldn’t sell just the covers but entire new dinette seat cushions were available for $90 each. Maybe they are the same as the 2016 originals but for the price it wasn’t a bad option. Some folks believe the industry might have learned to use better materials since this issue is so prevalent. Admittedly Fleetwood isn’t Thor but it’s worth a call.
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