I've tried that myself, and regretted it.
I had a toilet valve, on another brand of RV, freeze a few years ago. I thought it funny that the toilet valve was the first thing to freeze, but they really don't have any protection and are exposed (but not easy to get to for the repair). As I laid there all contorted in the floor trying to get the toilet valve out, I was kicking myself for not winterizing the RV before that first freeze.
Don't take the chance. If you don't want to fully winterize it, you could drain the water heater, then blow out the water lines with compressed air (careful not to blow real high psi through it or you could blow something). Don't forget to put RV antifreeze in the drains.
I just checked the weather in ABQ last Jan and the lowest temp was 16. Yeah, you don't want to skip winterizing your RV.
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