Winterizing in Reno

On the same RV storage, got asked by a trailer owner on the other slot where I'm going pulling my unit for camping. I said, I'll have a short camping trip to South Lake Tahoe and winterizing it afterwards.

He told me he never winterize and never did for years. He said Reno does not have sustained sub-zero winters.

I'm winterizing anyways since this will be the first time it will be stored here but any 2nd opinion? I rather err in the side of caution.

Thanks.