I agree with Papa-T, the use of anti-freeze in extended cold weather is much safer.
Personally, I blow out the lines with air as well, but my camper is stored in below freeing/sub zero temps for months.
Your portable compressor will probably not have enough volume to get most of the water out. You don't need any more than maybe 30 lbs of pressure, but you may need more volume.
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Doug and Patience and Shelby the mutt
2015 Crossroads Sunset Trail Reserve ST26RB
2013 Ford F-150 3.5 EcoBoost XLT Supercab 4x4
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