[A/S] Winterizing

["max23233" <max23233@xxxxxxxxx>]

I hope to use my Airstream through the winter on occasional bases.  I 
will be in Williamsburg, Virginia in the eastern part of the state 
where the winters are not to bad but does freeze regularly.  
The "average" low is 28 which means it often is down in the teens and 
even single digits. 

Will the pipes be safe from freezing by just blowing out the lines 
with an air hose or should I go through a complete winterizing 
process every time I leave?  I would rather not have to go through 
the whole process each time but will if necessary.  I have drained 
the fresh water holding tank and will be using city water.  

I may have the ability to run a small space heater while I am away 
but I still would worry about power outages.  

Thanks,

Max