I've moved my ball python eggs 2.5 - 3 hours twice over bumpy highways in stiff suspension trucks with no obvious bad effects. I basically turned the cab into an incubator with the climate controls to hold the temp monitored with a remote probe in the egg boxes. Make sure you avoid sun hot spots.
If you have room for a big enough cooler a better way might be to get a bunch of water bottles to incubator temp and that should hold for a pretty good trip (maybe sneak in a hotter one every now and then).
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Randy Remington
www.SnakeMorphs.com
FaceBook.com/SnakeMorphs