Or really large Disney bags.(I guess garbage bags would work too)
When I traveled with snakes for our move, I kept them in their caging and plugged it into a converter in the car (thermostat and all). Worked wonderfully. You could probably use a styrofoam cooler and heat packs, if you monitor it closely. (make sure to put a thermometer in there) Then you could place them in tubs with access to water in the evening and a heat source.
Best of luck on the move.