Alpha,
I just use air to get the water out in the winter, a small emergency compresser will give you all the pressure you need to get the lines purged.
Regardless of method used, be sure to drain your water system before you hit the road. Not that I would know anything about it, the drive home can freeze stuff you never would have thought could freeze.
Things like the dump valves get a little cranky when they have go from 35F to 20F on the three hour trip home.
Note to self: spend the 20 mins driving out of the way to get to the nearest dump station. Remember, heater, heat gun, bucket and the whole day dumping the tanks 5 gallons at a time really stinks, but someones gotta do it.
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Jim
When I was a kid I was going nowhere fast, now I'm an old man I'm going everywhere slow.
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