I suggest the best place to read up on how and where to drain and how to protect things is to check the manual first for info. Then we can often be of help if you need details.
Winterize details look like they are in section 7. Page 7-11 has a chart listing the general locations of drains.
Small point often skipped over is the little plastic filter at the end of the water pump. If left full of water, it is a real weak point when freezing!
Meanwhile there is a great tool to learn where they put things here:
https://catalog3d.winnebagoind.com/menu/Parts.htm
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Richard
Why no RV year, make and floorplan on MY signature as we suggest for others?
I currently DO NOT have one!