I've used howes and been towed,they did pay the towing bill,ive used power service,been towed,all it takes is 1 drop of water in a fuel line to put you on the side of the road at these temps.
the fuel in the newer tractors will stay heated as it is circulated thru the system,but a little condensation in the filter and its call a wrecker
by the way,I've also opened a brand new bottle of power service,and had to thaw it out,and it wasnt a year old either
if you either put #1 fuel or mix pure kerosene in your #2 fuel,be less chance of freeze up,in these extreme temps