I try not to drive on snow... Now this is not as "Amazing" as it sounds,, Trus (Shortened) story.. Drove right into a major blizzard in '06 in Utah, When it got bad I found parking, (Rest stop) spent the night, had dinner, had breakfast, Watched the news about all the cars in the ditches, Got back to the MH and hit the road again, by that time the state's snow crews had cleared the roads and all I had was clear dry (Mostly, some damp) pavement till I got to Salt Lake City and a specific parking lot I was headed to.. THEN I had snow to drive through, at about 2 mph for about 4x the length of my rig on very flat pavement, In short, no problems.
That's the way to do it.
Now as to the question about Propane.. First there are two gases sold as propane and one other thing you need to know about.
Butane is not much good when the temps drop, It will not vaporise properly, Butane is sometimes sold as Propane in the south.
PROPANE has a vapor temp of around -40 (I do not know the exact temp but it's close to -40) your choice of C or F at -40.you may notice some loss of pressure as you approach that point...
Oil, if it gets into the regulator, can raise havoc and more so at low temps.
Oh, just to be sure I did a search on the boiling point of propane:
The boiling point of propane is -42.09 o C. (Roughly -41 F)
Home is where I park it!