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It could be possible you are getting a down draft from the vents on the roof, the same thing happens on homes. If you think that is it, shut all your dump valves and see if it quits, shutting the valve prevents sewer gases from going up the hose, through your holding tanks and up and out the vents. If that is the case, you can put a trap or low spot in your sewer hose to hold effluent so sewer gases will not travel up the hose. Just my 2 cents worth........
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