Do we have to winterize if we use our RV during the winter?

This is to notify new RV campers that pink RV antifreeze will freeze hard in winter time hard freezes. For instance like others I poured generous amount of antifreeze in my toilet bowel to stop the flush valve from drying out and the antifreeze froze solid one winter while RV was in storage in Reno, Nevada and yes the antifreeze is a 50/50 water mix. Just saying