Keeping Tanks from Freezing During Transit

I put a small unit in my valve compartment...ran a 12v line and cigar plug (female)...all I do is plug in while moving, just remember to unplug when stop...don't ask how I know...the other way to remember to unplg is to put a 12v bed heat blanket in cabover it has LED reminder...yes don't forget to unplug that one too...but I tell you when you stop and it is 1* outside the warm bed feels so good. My tanks are in heated space so left furnace run at low setting...thing to remember is all you got to do is keep it above 32*. When I do my rebuild I will install a tank pad, just because I am doing a rebuild. All this made the travel in the cold much better.
12 v heat
Mine similar to red one..but yellow and got it a HF $13 works fine. Also insulated the door of that compartment and sealed air leaks around drain pipe and other places, stays dry now from road wash.