My APU does not keep engine coolant warm either, I didn't mention that in the original post. Lots of hate for Wisconsin in the posts! Haha. That's...
I try to escape when I can too... & I live up here for some reason! o_O
So if I'm stopping for my 10 hrs and it's 0°F, but I am using my APU which will keep my batteries charged, and I have anti-gel already added,...
I'm very interested in more details and pics. Where are you located?