I use tow/haul with a toad only when going through the mountains. On flat ground it really doesn't do much--especially when I'm driving with the cruise on (doesn't really shift a lot in that case).
As far as propane: Our first weekend out with the Axis it was 32F the entire weekend. The furnace gobbled up a whole tank in those two days. Your best to supplement that with a small electric (ceramic's are good for this) heater.
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