I recently purchased a 2009 Flagstaff 206ST, and have a question about winterizing the water pump side of the system (I have no hot water heater, outside or inside shower or toilet). There is no room to access the water pump or water tank line to introduce antifreeze. Is it feasible to pour antifreeze into the fresh water holding tank, and then run the water pump until I see pink at the kitchen faucet. After I do this, can I then flush the residual antifreeze from the tank with fresh water as long as I dont turn on the water pump again until de-winterizing (so the antifreeze won't absorb into the tank plastic over the winter and cause future taste issues)? Considering that my water tank is 12 gallons, how many gallons of antifreeze should it require for the pump to pick it up? Any help would be greatly appreciated.