First, I would just keep them separate. No need to add unnecessary stress to the trip.
Second, tupperware containers are my go to for transporting/temporary housing while cleaning the tank. So an appropriately sized tupperware container is fine. You can buy a heat pad either online or in store, not sure where exactly but they make them because that's what they ship reptiles with to keep them warm on the journey. You can either drill or solder holes in the containers.
Third, Maybe feed them so they have enough time to poop before the move (if they're on a regular schedule that is). Having poop in your containers probably wouldn't be very pleasurable.
Last, make sure they're secure and can't get flung around. I know you're probably a perfect driver but other people are unpredictable and hard turns or braking is inevitable, and you definitely don't want them flying into your dashboard!
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