Winterizing our new 2019 Mallard M26

Hi, I am running out of ideas for finding specifics on our trailer. So if you own A M26 and can help me figure out how to winterize it, I would be forever grateful. I’ve never done the antifreeze route and I understand that is the optimum way. Where do I start? Camping world is no help and it’s getting dang cold.
 
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