Winterizing question

OG, being left handed I tend to do things backwards a lot.  I will make a note of this and try doing this next spring as a test to see.  Up to this point I have only done it once whereas I used compressed air and then opened up the low point drains only to find a couple drops of water in each. 

The beauty of this approach is two-fold:  no after taste in the lines (yes we use our FW tank for drinking) from the antifreeze and only use 16 oz. RV antifreeze each winter to winterize.  On the 177 each of the three traps get 5oz. and the toilet gets 1oz. to keep the seal moist.  Northern Michigan winters are a good test and so far, after 10 winters no problems encountered.

I just learned something new from your post.  Funny thing is that the low point drains were never used on our 177 until the 5th year of ownership.  The sticker was a good 3 feet away from where they actually were and the other problem was that they were both covered by a good 4 inches of foam all the way around, looked like a hornet's nest!

When they were finally located and after using compressed air to blow out the water lines, each cover was taken off, and much to my surprise about 1 to 2 drops of water came out of each.  Apparently the compressed air was able to evacuate the water out as far as the low point drains.  Since then, they haven't been used or accessed.  Maybe the plumbing on the older pods (ours was built January 2011) was engineered in such a way that they were only needed if you didn't use compressed air.  Only for the first year did we use the 2 gallons of RV antifreeze and suck it through the system - and even though we never opened the low point drains - fortunately never had leak or freezing issues.

Is it possible that this tank drains from the low point drain somehow?   We had already drained those. 

Just want to make sure there is no water in the tank during our cold VT winter!