If you were a commercial vehicle you would be expected to drain the tanks every day of use. Most private motorcoaches don't get drained very often, some only once a year. As long as you have a good dryer on your engine mounted air compressor and have dryers on your 120 volt auxiliary compressor and, if applicable, on your 12 volt compressor and you drain those regularly, you won't see much water in your wet tank. Your brake tanks should NOT have water in them. If they do, you are not draining them often enough. I would suggest you install (or have installed) the cable activated drains on your front tanks (yes I need to do that also) and run cables to a convenient location so you can make sure that water is not left in the tanks.
Even on an annual basis, I don't get much water in my tanks and of course most of it is in the wet tank.
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