We found ours was the trap under the sink
We purchased a new to us 2014 Rockwood 8289WS and couldn't figure out what the smell was under the kitchen sink in the island. I assumed something had overflowed with the previous owner and with a little more cleaning I could get rid of the odor. Fast forward to a trip to the beach and like the original poster, we almost keeled over coming back into the camper. We found after removing a panel under the island that there was a trap/release valve under the sink. We took it off, cleaned it out, and put it back, tightening it more than it was previously (it was a little loose). It cut down on the odor significantly the rest of the trip. We will test it out the next time we camp to see if it solved the problem permanently.
If it had not been for this forum, we would never have thought to look behind the panel.
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