We used a memory foam mattress topper and that has worked wonders. I would put it ON the existing mattress, not under it. We keep the bed made so it looks good. However, we are in the mid-cabin, not the forwardd one, so we didn't need to make any changes to the shape of the mattress at all. They use a hot knife or a wire foam cutter to cut the mattresses. You can pick either up fairly cheap.
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