Hi sandy!
It all depends on where you're going (villages or cities, monuments or campings, etc). There are campings full of tourists with their luggage and there might be thefts, but just as everywhere. My piece of advice is: Be sensible and do what you would do at home
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I'd rent a van if we were too many and had a small budget (countryside, campings, etc), and a car if I wanted to be comfortable (cities, hotels, etc).