I have a manufactured home that is brand new that has 3 vent pipes coming out of the roof for the plumbing to vent. We live on 10 acres of open land and when the wind blows, the sewer smell can be smelled on our deck. I tried raising up the vent pipes about 3 feet thinking that it would not be right on the roof line wind. It helped a little, but not much, is there anything that can be done?