Couple years ago, Thanksgiving, we got caught in an unseasonable cold snap in San Antonio. The morning of departure it was 25°F and we were tank frozen, i.e., nothing would empty. Caveat here is that; I did not or forgot to turn the heater on (okay the truth, did not even remember we had tank heaters). But, by the time we got to Cabela's in North Ft. Worth things were thawed and used their dump station successfully. Every thing else worked as advertised and we had a successful trip.