Winterization blow out

The idea is to use the air pressure to get most of the water out, so when you add the antifreeze it isn't diluted, which could happen at the end of the line as the antifreeze pushes the water ahead of it. Trap some of that in the sink valves and you could still have damage by spring.

We're in MI and it drops below zero, with windchill, for about a month. The water lines are not very insulated. I would go so far as to call them exposed. We have never blown out the lines, only used the pink stuff. Never had a problem.
Just make sure you do it on time. We waited until early November last year and found ice because it had dropped below 32 for a few days. Like I said, not well insulated.

GLBCamper, we lived in Ohio about a mile from Lake Erie for 22 years.  In our first TT, access to the water lines to the heater was very difficult so soon went your route. 

I used a tire inflator (as you suggest) to blow out the lines - VERY thoroughly - and pink antifreeze in all the drains.  It only dropped below 0°F a few times.  We never had any problems with freezing where it shouldn't. 

My inflator did not have a pressure gauge, but as long as a faucet is wide open somewhere in the line, pressure buildup was not a problem.  It worked so well that I continued to do it on the next TT and now the Pod (although risk of freezing is lower down in Corpus Christi). 

Just don't stand close to the water heater when you turn on the inflator.  

Approaching my first winterization. I have read the forum "manual" and it says to use very low pressure to blow out the water lines. Can I just use an "inflator"? Some can be can be set between 3 & 120psi and I know you can buy a blow out attachment with the tire stem type of adaptor. Is there any reason I would need a full compressor? (I do live in a cold climate, so blowing the lines is a necessity.)