Traps will start to freeze at both ends at the same time. The bottom of the u bend will break. Also suck some pink thru the pump, you can't blow it out. That will take care of the small filter at the pump also. It is also a good idea to pump pink to the toilet or remove that valve and keep in house. One drop of water in it that freezes and you will be buying a new one. Some pink in the toilet will also keep the seal moist to keep the stink in the black tank. As for the different tanks, drain all per instructions, hot, fresh and close drain valves, reinstall plugs. Black and grey can have some few gallons in them ad lots of room to expand. I keep a clear adapter on the 3in drain so I know if a valve has leaked as if water freezes between the drain valve and cap, well it can be a "crappy " experience.
You will find a way that works for you and modify as needed.
Happy camping.
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Dale & Karen
2015 Lacrosse 311RLS
2006 F-250 The 06-6.0
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