I purchased 4 twin-sized mattresses (2- 8 inch and 2- 10 inch) for twin beds with twin-sized trundle beds that we have. So far we only have the 10- inch mattresses delivered but have found that they don't fit in any of the 4 bed frames. They are both too wide to fit onto the slats within the bed frame/bed rails on both the main bed and the trundle. Is there a reason the twin mattresses wouldn't fit the twin-sized beds?
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