Roadtrip humidity/temp concerns

Hello all. Im headed on a 7 day roadtrip. Outside temps expected to be 100 during the day and probably 30's at night. I have properly humidified cigars and airtight storage tubes for them. My question is.. if stored in the car in these tubes am I risking cracked wrappers before I even light? Probably going to be a dry climate as well. Utah and southern wyoming. Anyone dealt with this before?