We just did the same thing you are mentioning to our couch....we replaced the cushions with brand new foam, the material was still in great shape but the foam was starting to get flattened. However if your mattress underneath the cushions is really old it could also cause the couch to sag in the middle..we have a memory foam topper on our hide-a bed and it's decently comfortable..ande the couch now has minimal sag in the middle..
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2001 National Tradewinds 7372
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