If your RV is going to sit through freezing temperatures, winterizing is not optional. Done wrong, it means cracked fittings, busted water heaters, and expensive repair bills. Done right, it is just a methodical process you repeat every year. This guide walks you through the core steps: draining, blowing out lines, bypassing the water heater, adding RV antifreeze, and then reversing the process when you are ready to camp again.