I have a 2016 Jayco Redhawk and camped for a week in South Dakota last month (March) where the temp didn't get above freezing and one morning it was minus 2 degrees when we got up. I winterized the RV before the trip and carried gallon jugs of water. We used RV antifreeze and water for the toilet and bottled water for everything else. The only issue I had was that the black tank wouldn't dump completely until it thawed out. We had poopcicles even though I used some antifreeze. Next trip with temps this low I will use more antifreeze in the black tank. I should note that I didn't have any problems with the gray holding tank and also I did not use the heater mats to keep the tanks thawed because I was off grid for the week.