Could it really be this easy?

You can make winterizing much easier by installing a winterizing connection on the suction of your onboard water pump. This eliminates the need to pour antifreeze into the fresh water tank, where it loses some of it's freeze protection ability by being diluted by the water that remained after draining the tank. It also eliminates the need to flush the antifreeze out of the fresh water tank in the Spring.

I do not blow out the lines and only need 1-1/2 gallons of antifreeze to winterize our motorhome.