I took ours in to a tire shop about a year ago and asked then to pull both inside duals on the one side & replace the valve stems. I figured that was it because the valve stems were loose & would move pretty easy when I'd check the pressure. It seemed like it was better for a while after the re-valve but then the slow leak down came back. If I park and store it at 105psi, two weeks later I usually see around 90psi. It's a pain but I've just been dealing with it and checking the tires before every use. Our 2018 racing season just started so we're out and about pretty much every two weeks.
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