I never winterize but I'm gonna take a shot at answering these questions.
2 low point drains directly behind the wheels on entry door side. They were full of pink stuff, but wondered if I needed to drain anyway?
These low point drains are for your hot and cold water lines and should be drained.
I also have 2 water lines in my vanity in bedroom besides the 2 to sink. I can't find a way to get pink stuff in them, but they look dry.
These are vent lines and yes they are dry.
Also have a 3rd line that runs near outside shower, same thing, no pink stuff but looks dry.
This is your black tank flush line and it also should be dry. You could put antifreeze in it but it would just gravity feed into your black tank.
I am sure someone will correct me but I think I got your questions answered.
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