I stick a 3'' fertilizer hose in my exhaust and a blanket to cover what you are warming and it works wonders. I wouldn't haul water when it's cold without that hose on the pickup anymore. And when you get it thawed cover 1/2 to 3/4of the tank with a tarp and some plywood and it will help keep tank warmer and less ice chopping. I have to do that with a big concrete tank.