A number of years ago we replaced the small sink in our 19' with a larger, deeper, oval-shaped one. The sink we used is no longer available, but careful searching of online plumbing suppliers might find something you can use. If your cabinet under the sink is the same as ours (so many years between manufacture dates might mean it is different), keeping the P-trap directly under the drain might be difficult with a deeper sink. We have an L in the pipe just below the drain and moved the trap back near the trailer wall.
Tim
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