We have had the odor too. It turns out that its just after the trailer has been sitting in storage for a while. We found that if we flush it real good a couple times, the odor disappears for our entire trip which is up to 60-90 days. Then start the process all over again!
2015 Pinnacle 36FBTS
2015 RAM 3500 DRW, Laramie Longhorn, Aisin,