All I can say is my last coach had a strong holding tank odor every time I drove it. I figured it out to be the vent caps on the roof, I changed them to the kind that spin around to always create a negative pressure in holding tanks. Never had another smell, I had also tried changing the under sink vents to no avail. Maybe the wind is just right or wrong.
TomC
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2017 Renegade 40LRB
2014 Supercharged Jeep Unlimited toad
Roadmaster 9160 braking system.
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