Best to plan on winterizing, your unit is new to you and unless you know how it will hold up in those temps you should take every precaution. We live in NM and unless there is a major storm going through daytime temps usually rise above freezing most winter days. I have always just blown out my water lines adding a bit of antifreeze to sinks, toilet, and shower.
Works for us, but I know our rig's capabilities very well, no issues over last 20 years, plus we are always ready at a moment's notice to head south to AZ or TX for a quick respite from winter if we feel the urge. Good luck, hope your journey for the next couple of years in your new Class C goes well and is everything you imagined it would be.
