On my 3011DS there is a piece of metal or wood (I don't recall which) that extends 1 inch or so above the left and right hand "frames" that support the mattress and insert. I would think that you could get a piece of 2" high aluminum strip from a big box hardware store, cut it to length of both your left and right support frames and mount it to top of frame with screws. You'll want to round the inside corners so you don't snag the mattress insert when readying the bed.
If I haven't made myself clear, feel free to say so and I should be able to take a picture of mine over the next day or so and post.
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Christian M
2021 Forest River Forester 3011DS
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