A piece of felt or some filter media in the plastic filter housing would cut down on dust entering the compressor motor. ( not to thick)
I have water traps/regulators fitted to the outlets of my set up , just to keep the moisture out of what ever I'm inflating or dusting down.
I have a larger air compressor on board with a 5 gallon receiver (100% duty) that i use to inflate the complete set of tyres from the truck and the camper.
Not knowing your set up or seeing it i would be a little sceptical about inflating all your tyres at the one time with an ARB type compressor.
This type of compressor is mainly used for diff locks / air ride bags, but in saying that you can still top up your tyres every now and again.
There's suppose to be a pressure switch on the compressor, It's meant to turn the compressor off if the pressure gets too high, make sure this is there.
Here's the onboard compressor/water traps /regulators in my truck.
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03 F250 4x4 CC 7.3ltr 4R100HD rebuilt, 160,000 Klms
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