Hello. After doing a bit of reading, I've decided the simplest way to winterize our new popup will be to just add some antifreeze to the fresh water tank and let the pump draw it through the lines and out the faucets (indoor shower, outdoor shower and sink). I never did use the water heater, so that should be no problem, but I will open the drain just to be sure. Now my question, after doing this, do you leave the residual anti-freeze in the tank or open the tank drain? As a side note, my wife and I have a winter camping trip scheduled down south in December, so we'll be flushing the tank and lines upon arrival and re-winterizing after camping for a week (hence the desire for quick yet effective method).