I would get a small secure tub, melt in your holes, put in it a pile of newspapers, two hides, a dish for water and an old pillowcase (instant snake bag). Buy some of those instant 10 hour hot packs and toss a few packets of them in there as well as an old sock to put them in when you use them (keeps the snake from direct contact with them). Put the whole thing in a big garbage bag, seal it and put it in your trunk ready to go. Add in a big jug of water for you and for the snake.

That way if you have to leave on a dead run all you have to do is grab the snake, open the garbage bag in your trunk, grab the pillowcase and tie it in that. Once you get to safety you have a clean instant setup that you can have the snake into and warmed up, with fresh water to drink in no time at all.