Chevydominate they do make water traps for air ride
http://www.avsontheweb.com/water-traps/ Most run the line between the compressor to tank with a check valve then water trap.I have seen some run a water trap before the tank and between the tank and valves.I would run just the one between the compressor and tank and the winter months a few oz of airline anti freeze that the semis run it works.