Since you have a 2006 unit I would think that you developed this odor and did not have it when you got the unit, which would rule out the plumbing being wrong. I would put some water and soap in the tank and let it wash the tank while traveling and if that improves the odor, you know the problem is a dirty tank. Also, are you closing the grey water valves when dumping the black water tank? The trap under the sink should also block any odor from coming up from the tank. You could pull out the trap and clean it. Hope this helps.
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