I will tell you how my 29.3 is set up. Fresh water tank is under the bed with water fill port on passengers side of coach. To drain the fresh tank on the drivers side is where the water pump is located. Before the water pump is a in line valve that is used when winterizing, it stops the flow of water either way. Between that valve and the pump is a connection that when open allows the fresh water tank to drain. The same connection allows the pump to suck up the antifreeze. That is where the in line valve comes into play, have to turn is off so the antifreeze does not go to fresh water tank. I have another low point drain valve past the pump and two at the outside kitchen.
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S.O.B.
Retired and never looked back
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