Late Fall boondocking?

We're in about the same boat as Dan. Except we have a truck camper without the 4-season package. I know, not a bumper-pull, but the plumbing is similar if not as extensive. When it starts getting cold (say, 15 deg. F.), we pull the plug on the fresh water system entirely. Blown dry before getting into cold country. This means no showers until we get to a warmer place; drinking/cooking water stored in the camper in H.D. 1-gal. plastic jugs (variously 10-20 gals.) and use straight minus 50 deg. F RV anti freeze poured straight down the commode to flush the toile. This works until we get to about 5 deg. F, and then all bets are off, we throw in the towel and traipse to warmer climes. We have thick down comforters and, yes, "who is going to get up and get the hot water for coffee going?" If it's not too cold, the hot coffee water helps warm the cabin. It's gotten down below freezing in the box over night a couple times, but that's not my idea of a good time. You sure don't dawdle. We run the heater sporadically in the evening if it's cold, but not enough to need to recharge batts as we're usually on the road the next day. (looking for a warmer place). If we know it's going to be cold for an extended period, we always bring the Honda ie2K generator and run it for a couple hours every other day. We use a big separate lamp with 8-D cells for evening light for game playing and have very little draw on the system. The only time this ever failed me is when I left the fridge on DC after a long drive across the desert. It took my 3 batteries only 5 hours to go flat. I'll never do anything that dumb again. I have done some aftermarket insulationing with minimal results.
regards, as always, jefe