We just bought a used Jayco Jay Series Sport 12SC. We want to be sure to take care of it properly. The temperatures for the next 3 days are highs of 45 to 58 and lows of 28 to 33. After that the lows are above freezing. Do you all think I need to winterize the water system? And if I need to do that do I need to not only drain all water out but ALSO put RV antifreeze in the water lines?