A violin is light enough to carry in one hand but sensitive enough that a truck ride can genuinely damage it, between the wood cracking in low humidity and the bow hair losing its tension for good. This one travels in the cabin with you, not in the moving truck.
Pro tip: A two-way humidity control pack inside the case, alongside or instead of a traditional humidifier, keeps conditions steady without the risk of overwetting that some in-case humidifiers carry.
Watch out: Never leave a violin in a moving truck, a hot car, or checked airline baggage; temperature swings well beyond normal room conditions are the leading cause of cracked tops and lifted seams.