[rheavn]

Here are the instructions that Newell provides for any one who needs to winterize their coach.

How to winterize your coach
 

Turn water pumps off.  Drain your fresh water tank and holding tank.  Get 15 to 20 gals of RV antifreeze, get hose & a funnel and put in fresh water tank.  Unhook the ¼” line for ice maker in your plumbing bay.  Cap line off.  If you do not have a spicket on your galley then you need to turn off your filtered water on your panel.  Remove #1 and #2 water filters.  If you have a spicket turn pumps back on, run water in all your sinks until you see pink color.  Turn faucets off.  Flush your toilet until you see pink antifreeze.  If you have washer and dryer, run until you have pink antifreeze in tub then spin tub out.  Your Aqua-hot will have antifreeze run through when running all the inside faucets, shower and stools.  Turn water pump off and leave until you get ready to use coach again, then you drain tank.  Fill with water.  Run all faucets, shower and toilets and washer/dryer until water is clean.  Drain tank and refill with fresh water.  Reconnect ice maker line and install new water filters.