One of the reasons diesel is now more costly than lower octane gasoline is the higher standard of sulphur. we're at what now....15ppm..which means the refineries had to install new "stuff" to meet the standards.
Slowcowboy, driving a diesel is not that hard in cold regions. We never...read NEVER plug in our diesel Jetta. We don't even have an engine heater on it. It's simply not necessary with the new diesels. The rabbits...I'm not sure since Mike drives those mostly..but I don't think he plugged those critters in, either. And we're in Wisconsin...regular sub freezing after October, and subzero temps all January.
Diesel USED to be hard to find (in the late 80s I drove a diesel) but no longer. Possibly at some of the really out of the way towns there isn't any, but since I get 50mpg with the Jetta I just drive right on by those towns. (and if I do run out, well..that's what AAA is for!

)
The best thing about pulling with one is the power you have. Driving our gas van pulling a trailer up the mountains, we often slowed WAAAAY down..just no power. With the diesels, you just drop down a gear and keep on moving.
Sorry for the thread drift.

I had a trucker stop and chat about the trailer I pulled with the Jetta, and he suggested a simple airfoil on the front of the trailer. Lightweight, just enough to keep the air flowing UP instead of down and into the front of the trailer. He figured it would be more MPG and would cost maybe $50 to fabricate. I'm going to try making one from balsa ribs and canvas