Fresh Water Tank Winterize

So I've done a search and can't seem to find anyone saying yes or no to this. The winterizing instructions in the Forest River owners' manual mention putting some antifreeze in the fresh water tank. But most of the instructions I've come accross only involve using the small winterize hose in the pump house. It seems to me that if I just used the winterizing hose, then the hose going to the tank would still have water in it along with the fitting coming out of the tank. We always winterized the tank on the popup. Thoughts, opinions, ?. I also intend to blow out and antifreeze the black water port, and the fresh water inlet.