So Far No Issues

Good for you mjlrpod!  Except for the first year of owning our 177 the past 10 years we have used the same method, compressed air and then using a total of 16 oz. RV antifreeze for the 2 sink and 1 shower trap and then a small amount for the top of the toilet to keep the seal moist.  In northern Michigan temperatures also hit well below 0.  The good news is no leaks ever.  And the beauty of blowing out is once the HW tank is drained and the 3 valves are set to bypass it takes less than 2 minutes to blow all the lines out twice using air at 85 psi.  Works for us.

I dewinterized, and I don't see any leaks or problems. This is the first year I only blew the lines out, no antifreeze in the lines. I was nervous cause we had some good 15 - 20 below zero days. I used a little pink stuff in the sinks, shower, toilet, but from what I'm told, I don't have P traps. I guess the newer models have a different system called a Hepvo. I guess it doesn't need anti freeze, but a put a bit in.